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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