- Apr 6, 2004
- PEI, Canada
I have '14 Tahoe with 5.3L. Whenever I come to stop after driving, the engine doesn't idle smooth. Well, it does, for about 20 seconds. Silky smooth. After that, I can feel a faint shake through the floor. Before you say you don't feel it in your truck, put your left knee against the door trim while the engine is idling. Or look at the water in your plastic bottle in the cupholder. The throttle body, MAF sensor and the engine's insides overall are clean. I wiped the intake pretty good through the TB opening while cleaning it. Smoked the engine multiple times through vacuum booster, no air leaks. I have AFM disabled through the stock tune (the only thing that is changed in the parameters). And there is a two-stage (sequential) catch can on the dirty driver's side. I've been in several 5.3 trucks, and they all felt pretty much the same. Even the new gen DI engines have that faint shake. So what is it? Why the engine is smooth for a while, and then shakes all of a sudden, and runs like that thereafter in idle?