I just bought a used trans + and 3.5" LS1 MAF from a buddy of mine. I installed the MAF and trans +, and tried to run the car before I hooked up the two spark wires in order to make sure the MAF was working alright. The car ran terribly and would hardly rev up or hold idle, when i was able to rev the engine i could not get the MAF readings to go higher than 20 g/s (off direct scan). does it matter that i didn't have the spark wires hooked up? I figured it would still run, just not have spark control. The other question is that i may have had switch 4 (the one marked option) in the "on" position. would that have caused the problem? i put back the old MAF and piping and everything is running just fine now. I am going to try again soon i was just wondering if you guys had any info for me. Thanks.