I Have A 1991 Z28 It Has Been Running Rough Ive Changed Plugs And Wires Also New Gas As It Has Been Sitting For A Couple Of Months. It Seemd Like When Engine Got Warm It Would Start Running Rough. I Changed The Ignition Module And Now Vehicle Will Not Start. The 2 Connecting Wires Are Green And Yellow.does Anyone Know Wich One Is Positive And Wich Is Negative. Im Not Sure If I Had Crossed Wires As Now It Will Not Start After I Change Module

 

test

 

Not sure which one is which, try swapping them maybe?

 

maybe he is talking about the pickup coil wires.

 

No, he's speaking of the ignition module found inside the cap of the distributor.

Do you have the old one still? Put it back in and see what happens.

 

Keep in mind that an ignition module either works
or doesn't work, there's no in between.

Later

 

Exactly which is why I said to try the old one again, maybe the new one is a dud or he fried it.

 

I just did a search, tons of stuff with "running rough" but has anybody had the same problem with the ingnition module ( the one under the cap )!!