Just skimming the posts above try some Techron in the gas tank. It does work and part of what it does is clean the valves of carbon allowing them to seat properly.

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Frank
540/6

Dirrezas (4) @ 275/35-18, Eibach springs & bars, Bilstein Sports, Dinan Stage 2, slotted ATEs, Hi-Temp HTP pads, SS Lines, UUC-SS, White/Tan, Bling-free & Stealthy