Engine loses power

Electrical problem
1998 GMC Jimmy 6 cyl Four Wheel Drive Automatic alot miles

while cranking the engine I will lose power for about a second or two then it will go back to cranking normaly and the whole things starts over again. The engine will start if I get lucky

Engine Performance problem
1997 GMC Jimmy 6 cyl Four Wheel Drive Automatic

Heres the problem. So my car starts fine, when I go down the road a few miles and it shifts from 1st and 2nd ok, then the take jumps up to round 3000 and I have a loss of power but it still is going but not much power. I pull over and start again and it is fine till it shifts out of 2nd. After 2 days it gave me a check light and it said rear o2 sensor. Any thoughts?

I bought this jimmy and when you start it up it sounds fine but when you start to drive it has no power but when it warms up you would think it is a new one any info!

How do I go about checking that

Any coments people?

I have a 97 jimmy I was driving on the interstate and the cruise kicked up the motor. After that it has been running really ruff and dies at a low idle runs good at high rpms in park but when u put it under load it has no power. I have change the plugs and cat converter, no check engine lights. I am at a loss with it.

My 96 GMC Jimmy Has been Running Quite Weird Lately, The Engine Light Keeps Blinking Continuously, It Runs & Moves, But The Problem Is That It Does'nt accelerate Properly When I Push Down On The Gas Peddle? Like I Mean It Does'nt Stall Out, It's Just Like The Vehicle Is Not Getting Any Fuel, Power Or Something?

I have a problem trying to accelerate it bogs or hesitates and it does not ever come back up I have changed the spider, fuel pump fuel filter, 02 sensor I am at aloss trying to go from here any suggestions

Test the fuel pressure, it should read 60-66 psi. Also the throttle position sensor and the manifold absolute pressure sensor.

When was the last tune-up?
Could be a weak ignition coil.

The fuel pump which was replaced right before my posting was messed up due to some bad gas. We replaced it again & it's working fine now. I was ASE certified in engine repair & am in the processd of getting my CAT(erpillar) certification through a local college so it's not like I don't know anything about cars. I work on semi trucks & heavy equipment for a living & have been doing it for the last 25 years. I was just at a loss the day I posted the problem considering I had replaced the fuel pump, fuel filter, the fuel injector & the 02 sensor & 2 days later it started doing it again. I do appreciate the effort anyways.
Thanks
Tom

Vehicle started losing power at take off and low speeds. When I stopped to check it out the was a fuel odor and fuel in the oil. What could be the cause for this?

Its a multiport injection system The gas smell seems to becoming from the exhaust and from the oil which was about a quart over when I checked it.

Engine Performance problem
1992 GMC Jimmy 6 cyl Four Wheel Drive Automatic Unknow miles

I have a 1992 GMC Jimmy. When I step on the gas, it is a real struggle to accelerate. I have owned one before just like it, and it accelerated great. I'm thinking my fuel injectors are going out. I have already replaced the fuel pump previously, so that is all I can come up with. I'm wondering also if it has the spider or the cylinder with two stems? And, is it hard to fix myself? It is the regular jimmy that looks just like a blazer. Thanks for your help.