car has been sitting for a month, got the timing belt, water pump, alternator/power steering belts changed and wheel bearing and motor mount. it needs one more motor mount BUT after getting it back it now misfires. i checked timing and coils, and spark plugs for spark but (didn't check galling) and for a vacuum leak and nothing. there is no engine code being throw either. could it simply be bad gas? it rode fine before it went into the shop and on the way home but now it misfires. the vibration at idle is for bad motor mount i'm thinking. could a bad motor mount cause that? HELP
My car has 170000 miles.
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