erratic idle, dies after mods

Hi Guys, a little help? I have a 95 GT vert- Just got her back on the road after putting on the following: cold air intake, (stock mas) BBK 70 MM TB, Trick Flow street intake (70 MM opening) manifold, 1.7 cobra rockers, BBK shortie equal length headers, stock cats, Borla cat back exhaust, 3 dgress advanced timing... (Gears are coming!)

After about 3-4 minutes of driving, the check engine light comes on... my shop guy checked it and said it isn't throwing any codes. I drove it about 200 miles on the highyway this weekend and she runs great there, but in traffic it idles at 800 rpm, but sometimes bounces up, and then down, then dies. Lastly, upon lifting to shift, she actually revs up about 200 rpm, or the rpm "hesitates" for a second before falling off.

OK, it's drivable, but anybody have any clues to help me get these issues sorted? I understand (now) that a 70 MM TB may be too big for my mods, how much is it hurting? Will I see a significant improvement with a 65MM TB?? Would a larger MAS make a big difference or help my situation?

Thanks much,

Mike

Thanks Shaun, I will check with him and let you know. Your help is greatly appreciated. I've also read (someplace else) that drilling a small hole in the TB plate (??? part that opens and closes) can cure an idle problem. This sounds rash... and permanent if it doesn't work... I will have him do what you said first.

Thanks again,

(Sorry for my limited knowledge- I'm learning!)

Mike

Thanks everyone, appreciate the help. Mike