My engine vibrates well driving up hills then starts idling higher than normal till I get to level ground drive for 2-5 kms before it starts idling normally again. Any reason why it would be doing that?
1998 Chevy Silverado K1500 4×4 5.7 L engine
Keywords:silverado
Your engine does not idle while driving. It can only idle when setting still. If your engine RPM’s increase while under heavy acceleration, much like when driving up a hill, this is normal as the transmission downshifts.
However the engine should not vibrate unless it is not firing on all cylinders. With that in mind a good tune up may be in order.
Is the check engine light on?
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