Mysterious Miss at 3300 RPM

[Kim Johnson]

I have been stumped by this for 2 years.

The car just begins to "power up" under boost and at about 3300 RPM there is a slight hesitation or stumble. After which the boost will continue and pull up to 1.6/1.7(Charlie Spring) on the factory gauge but that momentary loss of power seems to take a lot of juice out of the power range.

I have replaced most every thing over the last couple of years, each time I make a change I expect this stumble to go away but I haven't found the culprit yet.

vacuum lines, bypass valve, throttle body hose, fuel pump. fuel lines, fuel injectors, cap, rotor, plugs and plug wires, valve job, control pressure regulator all this and much more have been replaced.

Any Ideas??

Thanks

Kim Johnson

Minneapolis

1986 5ktq





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