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Re: Gremlins in my 1989 C1500 - 350 5.7
all i can say is hunt exposed wires the best u can. sounds like something is periodically grounding out shorting the circuit. maybe lucky, loose fuse? lol
cup your hand over the end of a dowel, broken broom handle, or another solid wooden object. place the other end in various suspect places. when the sound is more pronounced then u know the general area of the issue. not a solution no but an easy way to locate the issue.
screams vacuum leak.
also, 45-55mph regardless of rpm = not engine, transmission. everything inside the engine itself for the most part is predictable, what happens at 45mph at 3000rpm in 3rd gear should happen at 30 mph at 3000rpm in 2nd. If u are just engaging 4th gear around there or OD, maybe one of the solenoids is sticking or something... <--- not a transmission expert.
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