MSD Cap build-up

[MAStuart]

In your checking the spark video, it didn't sound like you pulled out all of the plugs. Pull them all out, keep them in order, if one or several look different, it may lead you to a cylinder that is maybe having a problem. You can use a propane torch, heating up your plugs and your oxygen sensor slowly until all the carbon disappears. You said the car has been sitting for 2 years, fuel goes bad real quick these days. It could be as simple as a fuel injector getting clogged up. When this happens, a few cylinders running lean makes the oxygen sensor tell the computer we are running lean, add more fuel. Remember, an oxygen sensor reads how much oxygen is in the air, not how much fuel. It will keep adding fuel until its maximum amount, because the cylinder with the problems will still be running lean and keep pumping oxygen into the system. When you first start it, if it is like most computer things it is an open loop mode. Meaning it ignores the oxygen sensor, as it warms up it goes into a closed loop mode. It tries keeping it to what the air-fuel ratio is set at. Under wide open throttle, it should be open loop again. That would explain why it would start up and as you ran it down the road it started giving you problems and when you gassed it, it seemed to give you problems. Try to get it started without the oxygen sensor hooked up. Just a thought. Mark