[Sleepr awd]

it is likely not everything was connected correctly when he put everything back together. he would have had to take teh intake plenum off and get a new gasket for it. if he did that incorrectly, that will cause problems, also if he didn't connect one of the spark plug wires, it will misfire.

If he didn't put the right brand or quality of spark plugs it isn't going to run as good, and perhaps misfire.

If he put the wrong octane of gas it isn't going to run right either.

couldn't tell you for sure, but i'd sooner pull the motor and put a new one in than change the sparkplugs. lotta work, for not a lotta benefit