Alrighty, well I was getting no where with my car's problems before. It used to never start, and when it did it only ran on the front 3 cylinders and couldn't rev for nothing Turns out it was the injectors... I replaced them and it ran like brand new! I had also installed a megasquirt system to replace the old EFI system (Works great). Now I have a problem. Cylinders 3 and 4 are not firing. I know this because when I remove the injector connectors when the car is idling nothing changes to the idle. When I remove the spark plugs theyre wet and smell like fuel. I can feel the injectors firing by feeling the clicks, so I thought it was ignition. I've already replaced the cap, rotor, plugs, plug wires, and been through all the tests to find that the ignition circuit is fine. Nothing wrong with it. Anyway, can it be the valve clearances? is there anything I'm missing? I'm sorry if this posts seems a bit jumbled. If anyone has any questions feel free to ask! Thanks!

 

Actually, unless you're leaving out details, you don't know that cylinders 3 & 4 aren't firing.
Have you used a tool like (see picture below) to see if you have a spark on those cylinders?
Have you verified the injectors on those two cylinders are closing and not flooding the cylinder? You mentioned the plug are wet.
Have you done a compression check on the cylinders in question? (This isn't really related to the cylinders not firing, but it does relate to your question on valve clearance.)

 

Thanks for replying! I did some tests yesterday to verify that the cylinders are misfiring. First thing I did was take a timing light to the wires of each plug and they all fired fine. I replaced the two plugs, and that did nothing. I noticed this morning that it was running fine when I started it up and it idled cold great, but after a few minutes of driving it it developed that misfire again. So the misfire only happens when the car is warm or under load.... I did the compression check a couple weeks back and they were all good, I think they were in the 150ish range. The spark plugs are wet, but I wouldn't consider them so wet that maybe the injectors aren't closing. I can feel the clicks from the injectors opening and closing, and they are all brand new. Anyway, again thanks for the input!

 

What ignition system are you using? If it's stock, you may want to try swapping in an HEI.

 

I'm running the coil off MSII, but it has the stock dizzy

 

How old is the coil? I am focusing on parts that could be affected by heat.