1998 Chevy. Lumina Help Please!!

[plopper73]

Hey all, I've turned to you all in the past and I return once again!
I have a 1998 Lumina 3.1, I reccently have had a heck of a time with this car. When idleing its fine, but, put it in drive and its like being in a paint mixer. I was told to replace the fuel filter, which I did and it ran fine for 3 days... then I was told to take it to AutoZone to get a code which I did I was getting Multiple missfires, with suggestions from here and the AutoZone guy, I replaced one of the ignition coils, he showed my hubby how to test it with a OEM(SP?) meter, well it ran like a champ for 3 days, so we went and got the next ignition coil. This didn't effect it at all!! Its still jerking and stuttering like all holy heck. I am contemplating this deeply..
What next do I go buy the 3rd and final coil? and pray that its money not wasted? or what?
The car has 88,000 and is a champ when running correctly but, It feel so wrong to be driving it, but its all we have. I am all for suggestions - if there is a way to make it last until income tax I can sink a couple of dollars into it... btu I need help! I am handy, I replaced the alternator, starter, the battery, the plugs, the wires, So any suggestions welcome!

Thank you in advance!
L

[tblake]

maybe its ignition module related. The 98's are obd2, have that mechanic pull you a code, it should be able to tell you what cylinder is misfiring, or if its random misfires. I dont know. It is odd that it idles fine. Does heat have any effect on it? Does it act the same way cold as to warmed up? Good luck

[cadgear]

Agree with Blake. If its the same cylinders misfiring, and changing the coils didn't work, go for the ICM...or the wires/plugs. If its a random misfire, target just the ICM. Those things are heat-sensitive when they get old and start to go bad, so usually when the car is warm they'll act up most in my experience.