I'm desperately trying to get my motor started but it just won't turn over. Here is what I have: 85 GMC Jimmy 1990 tbi and sensors affordable fuel injection harness (with egr,AIR, knock removed)(also removed from chip) new chip edelbrock performer intake 454 tbi adapter plate I'm getting fuel I'm getting spark the timing is right (its been double checked) It's backfiring out of the tbi It's not turning over. I was really hoping for my blazer to make it to BB04 but I still have fab work to do and it's not happening until I get this motor running and debugged. I'm around Saturday after 2pm (driving school ) and all day Sunday. If you want to help a brother out give me a call 480-391-1080 Does anyone have a scanner for ALDL port?