i got a question here it goes my 89 gta 5.7 g92 with flows and k and n just keeps changing it's mind on how it want's to idel each day. Some time it idels all over the place. also when i go full throttle on my car it takes off like a 747 jet with nothing on board, then about third gear through fourth gear the car acts like it's a 305 with a five speed when your on your way to third gear(used to have an iroc)it just straight forgets that the driver might be racing just had a tune up, oil change what else could be the problem.

 

Punchuation is your friend and our's too. It helps us understand your post better.

What mods? That hyperjunk chip? It might be part of the problem. Also check your compression.