Need a little help here guys. 94ss 92k. New ff pcv valve wat pump. Ect temp sensor. Car not to long ago started missing on highway between 55-65 mph. It pulsates at red lights and when you first put it in gear and also takes a extra second to crank up although it always turns over. It lacks tire spinning power now and runs like crap and no cel. Hasn't turned off on me yet but now after a few minutes of driving it starts to smell like burning plastic inside the car. I'm thinking opti since I recently had a wp done twice after the first idiot messed up the job and nearly screwed my cam or flowmasters burning something being there fairly new. I need help. This sucks. I wanna ride.