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If higher mileage.. I would check spark plugs and ignition wires. You could be experiencing a misffire. Does the check engine light come on or flash when this shutter happens? If so, a misfre may be present.
Pull the spark plugs not the wires but the plugs themself make sure they are gapped right to your car and they are not wet in any way you might be getting spark but if they are wet you mise well forget it and just buy new plugs they are like 2 dollars a peice
On a 2005 Pontiac Aztek how do I tell what the order of the spark plugs are? I need to change mine and I don't know which plug to change first and which one would be next and so on. Thank you for your help
I found that a 2 inch adapter with a swivel made it easier than normal. I have also remoed the rear motor mount and lifting the engine up enough to ge to the rear plugs also works. Its not easy, good luck and I hope I helped you out.
you need a spark plug socket usually a 5/8 and a ratchet with an extension (might not need it) you might have to tilt your engine forward to get the back plugs(fwd) remove the boot(connected to top of sparkplug) ONE AT A TIME replace the plug and plug wire if you are replacing the wires RECOMENDED trace them one at a time and replace it, plug it onto the spark plug, then on to the next one, MAKE SURE YOU DONT REMOVE MORE THEN ONE BOOT AT A TIME, OR SPARKPLUG AT A TIME. take it one at a time so you dont mess the firing order up.