You no longer need to time engines like you use to in the old days. The computer advances and retards the timing depending on the information the computer is receiving from the sensors. Years ago you would adjust the distributor by twisting it while reading the degrees on the crankshaft sensor, with a timing light, and setting it to a desired spec. This is no longer necessary. Thanks and good luck :O)
To correct this problem I want you to get a can of intake cleaner (ABOUT $5.00) from any local auto parts store like NAPA or Carquest, do not use carburetor spray, intake cleaner only or u will damage the Teflon coating inside the throttle valve and air bypass valve, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.
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