2004 Buick Lesabre Running weird

2004 BUICK LESABRE
171,000 MILES
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SIRCARSALOT
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Ok so I pulled the spark plugs out of my car (one at a time) to check them to see if they need to be changed (they need to be changed) after putting them back in and starting the car I noticed the "Service engine soon" light was on started to drive the car it drove fine then started sputtering and jerking for a few seconds then went back to normal then about 30 seconds later it sputtered and jerked again then went back to normal what do you think could be causing this problem?
Sep 11, 2013 at 3:46 AM
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HMAC300
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scan for codes and check fuel pressure with a gauge first.auto parts rent gauges and will scan for free
Sep 11, 2013 at 6:26 AM
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HMAC300
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also check to see ifyou put the plug wires on correctly. see pic
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Sep 11, 2013 at 6:30 AM
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MADMIKE1735
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once you verify the firing order is correct, verify that you have the wires fully seated to your coil packs, and onto the spark plugs... the rear bank is kinda tough to access, so having the plug wire not fully seated is most common.... its happened to me before.... also, sometimes techs will swap coils, so the numbers on them no longer correlate to the cylinders.... i hate it when they do that, because it makes diag that much harder....
Sep 14, 2013 at 6:54 PM