MISFIRE I HAVE A 1999 PONTIAC GRAND AM 3.4 V6 AND iTS HAS A MISFIRE ON THE ONE AND THREE CYLINDERS IT RUNS REALLY BAD RIGHT NOW DOES IT NEED A NEW ENGINE OR SHOULD I GET A NEW CAR?

Yes, a very clogged fuel filter could cause that. A fuel pump going bad could cause that as well.

#3 should be center cylinder on back (firewall) side of engine.

You could have a faulty fuel injector, a bad spark plug or wire or even a bad coil. The 3.1 liters are notorious for having bad fuel injectors If there is a check engine light then you can get the code and find out which cylinder is misfiring then go from there. Or you could get the vehicle to misfire then pull of each individual injector wire to see which cylinder is misfiring, you will know which one is misfiring because when you disconnect the wire you will not feel any change at all. If you unplug one of the injectors to a cylinder that is not misfiring it will misfire much more.

2004 Pontiac Grand AM 2.2 liter DOHC L4 VIN "F"...




2004 Pontiac Grand AM 3.4 liter V-6 VIN "E"...




Hope help with this (remember rated this).

The PO300 code is random/multiple cylinder misfire detected. Sinsc you have the code PO302, that means that cylinder 2 is the one misfiring, usually a bad coil pack, or spark plug.

check crankshaft and camshaft sensors. If faulty they may cause misfires, poor fuel mileage, stalls, hard starts. Make sure the ignition coil is ok, including its powers circuit. hopefully this helps!!

Anything is possible but if you want to know if #3 is really misfiring and hurting the performance try pulling the plug wire to cylinder # 3 with the engine off (so you don't get shocked) Now start the care and see how it runs. If it runs the same then #3 is really bad. In that case imagine how much better it would run if #3 was up and operating correctly.

when u bent the push rod u might have bent the valve in the head ,by puting the longer push rod where it didnt belong it kept the valve open when the piston came up and the force of the piston on the valve bent the push rod,you will have to remove the head,hope this helps

Which engine 2.4 Twin Cam or 3.4 V6? The 4 cylinder engine is based on the old Quad4 and I would guess it's either running lean (weak fuel pump) or it's misfiring and you need to replace the spark plugs. Use only AC Delco platinum plugs or it will misfire ( other brands of platinum plugs can cause misfire, especially Bosch). If you have a 3.1 or 3.4 ltr V6 check for leaking intake manifold gaskets.

if it is a 4cyl probably a bad coil cover