My 2002 Chevy Silverado performs the same way. It surges also between 45-55 mph. It loses power and idles down. Rpm tachometer jumps up and down. So far I have changed the spark plugs/wires, ingnition coils, maf sensor, throttle body cleaned, cleaned the fuel injectors and changed the auto control valve,changed the fuel filter. Check engine light does not come on. Checked all the codes, came up with nothing. Truck still doing the same thing.
You should change the tps( throtal position sensor) this can cause that problem
Hello
The engine
and transmission in this cars drive train are fully
electronically controlled by a computer called the PCM (Power Train
Control Module). Whenever a problem like this occurs the computer
stores a record of the problem (there are of course some exceptions
to this, like the fuel pump for instance) in the form of a fault code
in its memory, to read these fault codes you must have the systems
memory scanned with a special tool. Once the fault code(s) are read
you then must perform the appropriate diagnostic testing to find and
resolve the problem(s) DO NOT REPLACE ANY PARTS UNTIL THE
DIAGNOSIS & TESTING IS COMPLETED.
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