Need help !
 

I just installed a TFS intake and a 70 mm tb on my speed density car. When I start the car it runs really rich, has a rough idle, and if you put you hand on the intake every once in a while you can feel a pop. the timing is at 13 deg. Do I have to switch to mass air, or is there another fix?

What fuel pressure and timing are you running, what cam?

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My Ride Check Out My Site 91GT, Holley SysteMAX II Kit-Heads 2.02" x 1.60",Full MAC exhaust 1-5/8" Long tubes, 2-1/2" O.R H-Pipe, 2 1/2" cat back, 12" K&N Filter, RNH PERFORMANCE Ram Air, Ron Davis Radiator, Full Suspension,3:73's, Welds, Best on new motor-12.60 @ 108, no traction 1.98

I'm running at 13 deg,have a stock cam, and still have the stock fuel pressure regulator

You need to change your mass air.