Ok my car is a 96 camaro z28. So at first the car got a small little stumble almost unnoticeable but it is getting worse everyday and now it is so bad the car almost cant get moving or when going up a hill it stumbles really bad. The check engine light is on and when it really starts to stumble really bad the ses light blinks. I went to auto zone to have them scan it for me but the scanner could not connect to the computer at all and I couldn't get any information from it. I checked the fuse for the cigar/accy and it was good and I also check to see if the lighter worked and it did work And now the throttle it starting to stick and doesn't want to idle down. Does any body have any ideas what it could be and why the ECM won't link to the scanner and I have plugged a scanner in this car many times and it has always worked. This car is my daily drive and is my only transpertaion to get me to work. And also I guess I should let u guys know that from 0-3000 rpms is when the car stumbles and anything after 3000 the car screams and runs real good and also when I unpluge the battery to reset the computer the car runs super smooth and runs perfect.

 

Did you use your scanner?