So my 99 gtp 179k runs weird. Its kinda hard to explain so please try to work with me. I've tried searching scouring the internet and I just don't know so here we go. Say I'm cruising down the road going 35mph, slow down to like 10 bang a corner and get back on it, it loses power. Like I get on it and the rpms drop then shoot up like 3k and it goes. It sounds like **** to. Then today I was going 80 oon the highway and lightly on the gas to keep speed the rpms were jumping from around 2600 to 3000 surging seeming like a missfire but no codes. I've checked plus, wires, coils,changed fuel filter,I did a compreson test, I'm pretty sure all my vacum lines are good. I'm at a brick walll with this. Its gotten worse over the past 2 weeks. Any help / sugestions arre much needed and appreciatted. Matt.
