I own a 99 Gt with some bolt ons. I drove the car the other morning and hammered down on it and let it rev up to about 6k in 1st and 2nd gear. On my way back to my house the car started missing. After i drove it around for a little while the miss went away. Well tonight i was doing the same thing. It started missing again but now it's not going away. It is not throwing any codes, no check engine lights or anything. It's holding great oil pressure and everything. Im stumped....It's missing from idle and up