The car is a 1998 Olds 88 with the 3800 series II motor, with 90000miles on it. I brought it to advance to check out the code and got the random/multiple cylinder misfire code. this is how it went down... Driving on the thruway (about 75-80mph) went to pass someone, the tach probably hit 4000rpm and then the car kinda cut out, there wasnt any power until the rpm dropped back down. And the rest of the way home if I went to 4000rpm it would do the same thing. the next day it seemed fine but once in a while it would lose power at lower RPMs (~2000 - 3000). If I hold the gas down when its misfiring (losing most of its power) after a few seconds it would regain its power and run fine, then lose it again later on. The poblem happened suddenly, but a friend that works at advance said start with a basic tune up, i doubt that would help because the problem started instantly. I was think a crank or cam position sensor. Any idea?
thanks,
Steve