I have a 350TPI in my 88 camaro.

Ive been having a problem with code 42 popping up recently, but it would almost always go away the next time I started it. Now iv been getting code 36 with it (as well as 42). Its very intermittent, comes on at random times and when its not on the car runs great. NOW, i seem to have a stumble at around 2000 rpms, its slight, but you can feel it.

I know both codes are for problems with the ignition or injection system. I ohmed my inj's warm and cold several times a few months ago (maybe 3-4) and they all checked out ok, 17 ohms and within .5 of each other. They are the stock multechs. I will ohm them out again tomorrow, if i can. Its got a brand new ESC, coil, and spark plugs. Ive heard of the knock sensor causing these codes and similar problems when they start failing, i havent replaced mine and I dont know how old it is. The cap and rotor arent old, they are accel brand, but I noticed there is a gouge on the inside of the cap. The rotor was somehow rubbing up against it and grinding the inside of the cap away. It doesnt seem to have gotten worse, but i will be getting a new cap and rotor soon anyway.

The car also has brand new fuel pump, tank, sending unit, and fuel filter, all which are less than a year, no more than 6 months old (dont remember exact age).

Thanks for any advice