[MustangGT1990]

MidNiteBlu 5.0,

I'm just curious...you said your check engine light has never came on. Does it come on when you turn your ignition switch on? The reason I ask is because mine DIDN'T, which is not a good thing. So after a little inspection I found out the previous owner had taken the bulb out!!! Like PKRWUD said "You don't need a code puller, all you need is a jumper wire, and it doesn't matter if the light never came on. I'll bet you there are codes stored." As long as the check engine light is functional you can pull codes out in a jiffy. Also, on my 90 5spd you have to hold the clutch pedal in before the computer will start giving you any codes. I didn't know this the first time I tried it and thought my computer was dead. It's amazing what we learn the hard way. Don't give up!