So i went to the track today, and ran a best of 13.72 @ 100.7, with a 1.96 60'. before my 4.10's and plenum, i ran 13.58 @ 99.8 with a 1.8 60'. this is the second time iv went to the track now and done so bad, last time i didnt know it but i was misfiring lol, bad plug. this time, i found out after 2 runs of 13.8 that my MAF wasn't plugged in...so i plugged it in, launched the same, and isntead of bogging at 4000 rpm's like before, i spun like crazy and went sideways a bit. last run was 13.7, i spun all through first and almost halfway through second. why am i running so much damn slower? i launched at 3500 that last run also after a pretty big burnout. oh also i noticed, my idle when i neutral on the highway was bouncing all up and down from 1000 to 500 then 700 then back up, it was really weird. im pretty sure ignitions all fine now, recently i had to change my MAF and i put in one from another GT, could that cause any problems?