Detail: I have a 2000 Grand Am Pontiac---Code indicates a random misfire...replaced coil pack; spark plugs; coil housing; and fuel filter. Car starts after 2x. Service Engine Soon light is on. Car was running fine. Now, engine stops when driven at 45 miles per hour. Car will run w/out engine stopping if driven at 20 mph.
Solution: Indicates a low fuel pressure problem random misfires are predominately fuel pressure related rather the electronic check pump operation , pressure regulator, filter , and EVAP for not venting the fuel tanl , Hi, a 6ya Mechanic can help you resolve that issue over the phone in a minute or two. Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US. click here to Talk to a Mechanic (only for users in the US for now) and get all the help you need. Goodluck! , Im surprised that didn't fix it. On the Quad4 engine its usually a cracked coil housing. Have you checked: fuel injectors / fuel pressure coolant temp sensor compression - to check for bad head gasket ignition control module EGR system - make sure the valve isn't stuck crank position sensor. The crankshaft position system variation compensating values are stored in the PCM non-volatile memory after a learn procedure has been performed. If the actual crankshaft position system variation is not within the crankshaft position system variation compensating values stored in the PCM, DTC P0300 may set. , Check the plug wires for those 2 cylinders, next check the injectors, as they can cause misfire when defective. , A misfire doesn't always have to be ignition... it's just the most common cause. Faulty or plugged injector, low compression. You need to check fuel pressure and test the fuel injector flow. Then check compression. If you don't have tools for these tests, take it to someone who does. Testing is much cheaper than throwing parts at the problem. , Check your fuses. I belive the radio fuse is on the passenger side of of dash where it meets the door.