I just changed the optispark last week. It was running good for the weekend. then it started dying at stoplights. It was the maf sensor, (throwing a code), so I popped in a crappy one that I had, and it started working perfectly. Now, a week later the car shakes like hell. It has extremely long cranking time, it has had hard starts before and after the opti. what the hell is wrong with my car now. It runs rough at idle, and it shakes when driving too! I am getting sick of this! I just want this thing to run right. Anyone got any ideas! -Michael