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Loping under light throttle when cold.


Rudie Del Rude

Well-Known Member
Joined
Sep 20, 2007
Messages
75
Age
36
Vehicle Year
1997
Transmission
Automatic
My truck runs great, the only thing i've noticed lately is that if i start to drive and the engines a little cold, when i barely give it throttle it lopes. It doesnt sound like its gunna die, but its enough to make ya bob back in forth while your driving through the neighborhood. Its done it in the summer, and still now in the winter.


No mil codes. Ive got new MAF and 02 sensors, new EGR and IAC valves. Plugs, wires and fuel filter were changed maybe 25k/35k miles ago. Upper and lower intake gaskets were changed maybe 40k ago.

I do know that i broke the broke the seal on my throttle body when i pulled up the intake, and didnt put a new gasket in for it.

Its not a huge problem, but its not normal and i dont want this to combine with something else later on and make the problem worse.

Where should i start?



EDIT: I've also noticed a whistle coming from the engine under about 35-36% throttle. Only a specific point in the throttle, the pitch changes if you play with the pedal a little.
 
Last edited:

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