Idles rough

Changed from one coil brand to another. This one does the same thing.

Switched back to the factory coil. All is well now.

2003 Pt. Crusier turbo automatic has a rough idle and sounds like a misfire when in park or when in gear at a stopped position. Seems to run fine when in park when you hit the gas or when you are driving. Use premium gas all the time. Seems to take 8 to 10 seconds after you start the car before it starts to run rough. Put new plugs and wires on, didnt help. Took it to the dealer, they did all there tests, couldnt find the problem. No check engine light comes on. Cant find any vaccum leaks either.

I figured my 2002 Cruiser was due for a tune up as it experienced hard starting and a rough idle until it warmed up. I said hey what the heck do the timing belt too. To date I have replaced the timing belt, alt. Belt, air-conditioning belt, water pump, radiator, anti freeze, engine oil and filter, transmission oil, thermostat, spark plug wires, spark plugs, PCV Valve, EGR Valve, removed and cleaned the throttle body and removed cleaned and measured the IAC Valve then replaced all 4 fuel injectors. I still have a hard starting problem and a rough idle but now all the time.

If I had any money left I would not be here looking for a free answer.

Engine Mechanical problem
2002 Chrysler PT Cruiser 4 cyl Front Wheel Drive Automatic

My car has a shaky idle, almost like a misfire. The system is tossing a misfire code in cylinder 3 at the mechanics, I have paid to replace the plugs, wires, coils, and it has helped, however the dealer reccomened a compression test, and cylinder three was 125 and the other 3 were at 175, what does this mean? Is the repair possible? Are there anyother things that could be wrong with the car?

I started having trouble with my car yesterday. I drove it into a heated garage to let it warm up and to check for leaks. When I went to start it up to go out of the garage it began to idle very roughly and tends to jerk. I am wondering what this is and how to fix it.