I have a rough start

No I have never ran out of gas.

Engine Performance problem
2004 Kia Rio 4 cyl Front Wheel Drive Automatic

i am working on a 2004 kia rio that codes p1166 and p0171. I have been checking all sorts of sensors and have run into a dead end. Could you tell me what the g/s value for a maf on this vehicule should be and if you have any ideas please tell me.

A 60,000 mile used engine was placed into my 2001 Kia Rio. The only problem at that time, was a rough idle in "PARK". Has gotten a slight roughrt over time.A few weeks after install of engine, codes P1166, P0101, P0301, P0300, P0507, P0304 appeared. I replaced the MAF sensor, & the O2 sensor(Bank 1, Sensor 1), (in the front area, above the cat.)Two weeks later, the MAF sensor has cleared, but, the O2 sensor. Is still showing trouble. As of date, the current codes are P0507, P1166, P0300, P0301, P0302, P0303, P0304, it still idles rough in "PARK", seems to run better then the old engine, quietter, & smoother !How can I clear these codes(for emissions test), & stop the rough idle?Also, gas mileage has decreased by 2 mpg, over the seven weeks.

UPDATE -- I have replaced several gaskets. Since then, all codes except P1166 have disapeared(this is the second O2 sensor installed in three months).P0101 has now appeared, I installed a third MAF sensor. The car still idles rough in PARK. After I picked the car up, the check engine light was off. Ten minutes later the check engine light came back on. The reader showed 1 fault, & 1 pending.(P1166 & P0101 P )It appears that once the car reaches a certain temperature, the check engine light will come on, & idle rough at the same time. The O2 Sensor & MAF are after market sensors. CAN THAT BE THE PROBLEM? PLEASE HELP ! A few days later the check engine light goes back out. What does PENDING mean?

Hello, I have been having trouble with what seems to be the same problem for some time now. I bought this car about eight months ago and was told it always started hard if left outside (I live in Manitoba, Canada so this seemed only natural in our winters). I have a heated garage so this was not a problem. But I did find that it started hard after sitting outside in only moderate cold for just a couple hours (it has a newer strong battery in it).
Also, I noticed that it did not get nearly the gas mileage it was meant to get. Since then the gas mileage has remained poor, it still starts rough, but now the acceleration is constantly terrible. It takes a full mile to get to 100 km/hour (60 mph).
Also, on two occasions the car has refused to go past 45 k mph. One of these occasions was after I went through some mud on my road, and the other was a after driving in a torrential rain. When this happened, the car would not rev extremely high, it would simply bog down and refuse to go faster. I have also noticed it is especially sluggish in high humidity.
The other symptom that I have suspected might be related is a loss of breaking. It is not that I lose my breaks altogether, I will just have to stomp them pretty good. This problem comes and goes from one stop to the next, but it does seem to happen when the car is feeling particularly sluggish.
I have replaced the spark plugs, the wires, the ignition coil, the throttle body gasket (it had come apart and needed replacing), the o2 sensor, and cleaned the MAF sensor. For a time I thought I might have water in my tank so I put in gas-line antifreeze. It did seem to help with the rough starting for a time, but I wonder if it was a placebo affect. Any thoughts would be greatly appreciated!

Fuel pressure was good (48psi, but there was a small leak in the guage which I have to imagine cost a few more pounds of pressure). I checked for vacuum leaks and couldn't find anything (I sprayed with carb cleaner around all the hoses and connections). I did come up with 9 codes: (P0501, P1166, P0303, P0138, P0121, P0325, P0304, P0300, P0102). Thoughts?

My car ran hot about 3 weeks ago. I had the water hose replaced and all the fluids replaced. When I tried to start it, it wouldnt so I had the spark plugs changed (just hd a tune up in jan). Anyway now, when I put my foot on the gas to go, ut moves about 10 miles per hour. It shifts and then I can go fast, about 35 mph. When I make a stop, I have to sart again slow, I mean barely moving, take my foot off the gas, let it shift and then I can go about 35. I wont dare try to go on the interstate! Any suggestions. Oh, it's sometimes hard to start too. I have to turn the ignition to start, put my feet on the gas and then start the car. Please help!

Yes, the check engnie light is on, I had a oil change and then took it to the auto store. They said the crankshaft sensor is bad. Any advice?