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Yes I removed one plug at a time to check compression in each cylinder. And yes I had the college do a smoke test and the only vacuum leak we found was the hose going to the valve cover. I replaced it but obviously not the problem.

Hmmm. Okay. Well I'm still trying to figure it out. No noticeable vacuum leaks, but the chances that it would only be messing with once cylinder is beyond slim. A local mechanic that I used to strongly trust seems to think that it's the MAF. But I now think he's an idiot because the 7th gens...

Okay I'll give that a shot. I know there is vacuum pressure in the valve cover, could the valve cover gasket be pulling a two-fer (vacuum leak and oil leak into the spark plug tube)?

Ok good to know. Yeah I have been working on cars for a long time and I know everything is installed correctly. I'll check for vacuum issues but the likelihood that it's only affecting one cylinder is small but it's worth a shot. Is there anyway there could be issues with the block itself?

Should I pull the valve cover off and check the spark plug tube seals and see if there is any oil in there? Would that prevent combustion?

Ok well regardless here is the update. New injector is in (Beck/Arnley) and functioning properly and there are no leaks. However the issue still remains. Injector is spewing fuel, spark is bright and vivid, and compression is solid. So now where the heck do I go from here? ** Just...

So I checked both the connector for proper voltage as well as the injector for proper resistance. Connector has over 14 volts and the injector's resistance is different than the rest so I'm assuming it's just a bad injector. The plugs all looked the same because the previous owner said they...

In all honesty though, what is the likelihood that just the one of the four connectors is bad? I'm trying it tonight so I'll keep you all posted.

So since I don't have a working multimeter (I'll pick one up tomorrow), I just unplugged the obd2 connector from the injector and the idle didn't change. I'm thinking I should just order an injector.

I do yes. Some have a little bit of black around the threads. Nothing major on any of them.

Checked compression last night and it's great. How can I test to see if it's the injector? Should I just swap it with one of the other cylinders and see if the misfire switches with it?

So here is my problem. I recently purchased my 93 ae102 (1.8L manual) and have been loving it. However it seems like it's idle is pretty rough as it shakes the car, like it wants to die. I figured it was a misfire so I went to check the plugs. While keeping the car running, I removed each boot...