I fixed my idle I had a leak in the intake manifold gasket. But now when I jump on it the car feels like it wants to go but something is holding it back? It'll start to go then start backing off alittle and go alittle more then back off alittle and it keeps going like that and I doesn't matter what gear I'm in. Any Ideas? I thought it might be the fuel filter.

 

Could be, any way you can check your fuel pressure?
Also could be some bad plugs or wires.
But make sure you dont have another vacuume leak.

 

Well I just gave it a tune up and it never had this prob. before the headers were put on my dad and i try jerry riggin the stock down pipe to the hooker headers the passenger side we twisted up pretty bad could It be that the exhaust flow is getting messed up because of it and causing it to lag like that? And I replaced the fuel filter and it didn't help. But how would I check the fuel pressure?