engine problem on 1999 Mitsubishi Galant

i have mitsubishi 1999 resently i repleiced the timming belt and valves but some times has a litle shaking and some time it is normal what can be te problem

by in Grand Rapids, MI on May 25, 2009
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1 answer
ANSWER by , May 25, 2009
Did the shop replace the spark plugs when the timing belt was replaced, sometimes just a tune up will smooth the engine idle ( air filter, spark plugs,spark plug wires etc ) Start with a tune up and oil change before going any farther.