Pontiac Repair: 1990 Pontiac sunbird 2.0l with a 5 speed manual transmission, pontiac sunbird, 1990 pontiac sunbird

Question
what can cause my car to loose power in 3rd 4th &5th gear but be ok in 1st and 2nd gear.i recently replaced the timing belt and the mrks are lined up on the timing like it should be.

Answer
Hi Jonathan:

Well let me ask you this did this happen right after the belt was changed you noticed it, Or did it just crop up out of the blue? It makes a difference as to what way to look at this.. You could have an issue with fuel pressure or volume. A plugged fuel filter or a pump that's going bad.. Does it feel like it's misfiring or just lack power? If it feels like a misfire I'm look at the plug wires and cap and rotor.. These are just a few ideas to get you started.
Good luck :)