I have a 1997 Olds Achieva with an code of P0300 (Cyl misfire detected (random)). I have replaced the fuel filter, checked fuel pressure (45 PSI), tested the TPS throttle position sensor (operates with in tolerance) replace the spark plugs, checked for vacuum leaks, replace air cleaner and am at a loss. My wife drove the car to work (about 30 miles) with no problem, when she went to start it to leave it wouldn’t even idle with out stalling. Any suggestions would be greatly appreciated
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What engine is it?

 

It a 2.4L, 4 cyl

 

its one of 3 things and theyre all in the cover on top of the engine that you take off to get to the spark plugs,ignition module, coil pack, or the cover itself. sadly, with a random misfire, its a trial and error fix, the cheapest way is to grab a decent looking cover assembly from the junkyard, install the whole thing onto your car and see if the misfire goes away, if it does you can call it a day but my experience with junkyard electronics is that they crap out within a few weeks so i would pinpoint the problem part on your old cover by swapping between the 2 covers one by one and replace it.

 

Thanks for the Info, that's what the problem was and it is up and running again.





Thanks again for your help