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About GURU1239

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  1. Guys, I just picked up a 2008 GMC Sierra 1500 SLE 5.3L and I am having some crazy problems. It has a rough idle on cold start going from 525-750 rpm very quickly. I have stalled it before putting it in reverse and the rpm fell so low the engine could not recover. When accelerating at 20-40% throttle, the power is very choppy at around 1600-2000 rpm(hard to explain), but it feels like the throttle body is hanging up or lacking fuel. At 100% throttle it runs better but the power is still choppy. Cruising at 40 mph, if i give it 30% throttle it will fight to climb over 2000 rpm (VERY CHOPPY) and the acceleration is very very slow. once it gets over 2300 rpm it seems to smooth out but its not all there. Truck looks to have brand new throttle body, new spark plug wires, and i just had the dealership change the pedal position sensor since it threw a code. Also, the throttle body on the truck does not seem to be OEM. I went to change the TPS with an OEM one and it was not the right fit as the prongs on top did not match. I have hooked this truck up to a diagnostic program and it threw no codes after many fuel, ignition, air, and rpm tests. Also, if i am just cruising through a parking lot off the gas pedal, the truck will accelerate for like 2-3 seconds and then return to normal. Please let me know if you guys have any ideas on what this could be.
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