ANSWERS: 2
  • you could try a motorvac. cleans the fuel system and cleans all carbon deposits from the engine. carbon buildup can cause pinch points in the cylinders which will ignite the fuel before its supposed to which can cause piston slap. gasoline can ignite without spark if compressed enough. low octane gas is more prone to this than higher octane. so switching to a higher octane solves your problems.
  • One other thing that sometimes works is just resetting the ECU. This can be as simple as pulling the fuse for a few minutes. On many cars, this resets the spark timing to a conservative setting which may be just enough to solve your problem. Be warned that this doesn't always work though.

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