Strange Random Misfire

94svtcobra302 said:

theres no check engine light and the maf was cleaned when the engine was rebuilt

Click to expand...

Only 13 of the possible 99 codes actually trip the check engine light on an EEC-IV car. So it's possible to have tons of codes, and never see the CEL.

Also, at the end of the code reading process is a test called the "cylinder balance test". What it does is turns off the injectors one at a time to identify a misfire and tell you which cylinder it is on. REALLY helpful diagnostic tool.

So for your car, first thing i'd do is run the codes, and perform the cylinder balance test.

A search will find plenty of posts on how to do this. For a code reader, i'd really recommend this one. You can also jumper the test plug and count blinks as well.

http://www.amazon.com/dp/B000EW0KHW/?tag=stangnet-20

How to perform the code test and cylinder balance test without the reader (post #2)

http://www.stangnet.com/mustang-forums/threads/checking-engine-codes.868753/

Info on performing the "cylinder balance test"
http://www.stangnet.com/mustang-forums/threads/cylinder-balance-test.695039/