Do I need new throttlebody?

andy

I have a '90 hatchback DX.  I am having trouble getting my car to go faster than 70 MPH.  I have changed all filters, gapped lifter clearance,and adjusted timing.  I also replaced busted Cat with Hi-Flow Cat and installed a cat back system with a Magnaflow muffler and tip.  So my whole exhaust is good, and I still have the problem getting past 70.  It runs good in first, but starts to hesitateslightly in second and less power in upper gears (hard to make passes on the highway).  SOOO - do i need to rebuild the throttle body on my car or is it better to buy another one?

.sounds like theres a vaccum leak or somethings just not right.... i dont think its ur throttle body but it could be

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Originally Posted by JDMpower5950sounds like theres a vaccum leak or somethings just not right.... i dont think its ur throttle body but it could bethank you, i will look into it, can't believe i never thought about a vaccum leak

.you chould also check into posting in the right section, like the tech section, not members rides (pics).

.Check your fuel filter too, that could be the problem.

.ur problem is ur engine
its got no power especially if its automatic

dx is dpfi with slow ass gears which is like asking not to go fast