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Truck accelerates on its own
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Question
Rgbraun1
1999 Silverado 5.3 vin T.
Hello, I'm new to the forum. Here's my issue with my truck: I felt the slightest surge while cruising...I planned to do my ujoints so while replacing the U-joints and carrier bearing I decided to clean the throttle body and ended up replacing the IAC. On test drive I got a violent shake so I pulled the driveshaft and 180 degree turned the rear shaft on the slip yoke. The shudder went away but i noticed the the truck accelerating on its own, i put in gear and tap the gas and can take my foot off the gas and it will slowly accelerate through all the gears and gain speed. I put on a new TPS. Drove the truck 200 miles home (did all this work at my dads garage) and got a shake bewtween 35-45 mph and the accelerates on its own. Started getting different codes so I replaced EGR, MAP, MAF, throttle body gasket, engine temp sensor, plugs and wires, PCV and PCV grommet. I also replaced the connectors for the TPS and IAC. I finally took it to dealership and it took them 2 days and 3 techs to tell me it was intake manifold gaskets. So I replaced the gaskets (and the knock sensors and harness) but it still accelerates on its own. So, as it sits. My truck still accelerates on its own and it shakes at 35-45 mph. Is the shake from an imbalanced driveshaft? Or a bad torque converter? Can a bad torque converter cause the accelerates on its own problem. Also, while cruising, I can take my foot off the gas and the truck will maintain its speed. I have tried removing the cruise control fuse to be sure it wasn't faulty. Hoping someone can help. Thanks.
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