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N/A flat spot?

Mate of mine has a 1990 N/A it has induction and decated exhaust. It has a flat spot between 1.5 and 3k revs.

 

He says it feels like an old carb car that is flooding, the more you put your foot down worse it gets. If you lift off a little it improves a bit. over 3k all is well, with no probs at all.

 

Def no fuel leaks, thinks there maybe air leaks.

 

Anyone have any ideas?

 

Over to you guys.

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    Check the tps, not for linear setting but for closed throttle switch, if the closed throttle switch setting is incorrect then it opens late and the ecu gets mixed messages and hold back the fuel injector pulse, this is possible to test for at standstill by slowly raising the revs from tick over up to 2k to 3 k and see if the revs hold back and struggle to rise.

     

    Jeff TT

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