detail's? efi? carb? mods?
I mean dude, you gotta understand, people ask these questions quite a bit, some people say example:
'my car overheats in traffic'
But this person fails to mention that it's a 408 stroker with 11:1 compression, and an autozone electric fan 
You did mention your car idles at 500? thats a start, definately a problem there, and id say you could have a bad maf? but does it 'pop' thru the intake or exhaust?
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X-Texas highway patrol ssp 1990 coupe - exploder Gt-40 iron heads, Explorer intake, 19 lber's. E-cam. crane 1.7 rollers. 190fp. 75mm maf. 65mm tb, tubular subframe connectors, mac cai, Asp crank pulley, T-5, king cobra clutch, flowtech 1-5/8 unequals, mac X-pipe Frpp driveshaft, lakewood Lca's.
race weight 3,160
12.69 @ 107.35, 1.71 60' 26x8.5 drag's 3.90 gear
13.20 @ 106.91 - 235/60/15 firestones 2.3 60' 3.27 gear
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