LX issues

[TwiStEdMuStAnG]

I just finished installing new gaskets by headers thinking this would solve my problem with the power I'm losing on my stang. It starts up strong now. Now my problem is is that when I'm on 4th it feels like the car doesn't wanna move any more and the right becomes rough. Does anyone know whats the problem?





89 Mustang
Morso Air Intake
Cobra Intake Manifold
Ram 2500 Clutch
Straight Pipe with Flows
AC Deleted

 

[Mustang5L5]

4th gear WOT??

At that speed, a stock 5.0 doesn't really pull that hard.