Misfire at higher rpm idle?

[volcomsnow245]

Hey guys just a little confused to why when I let my car warm up on hotwire on my safc, that it idles at about 1500 and you can here an occasional misfire but when I switch it back over to karmen the idle goes back down to 700 with no misfire. Also when I don't shift right away out of 1st gear (when i'm giving it a little gas) it feels like fuel cut it's weird.

 

[joseph95]

have you checked anything out? plugs, wires, coil

 

[fast90eclipse]

Or could b ## ignition too. Is ## timing dead on. Have u slowly pulled ## spark plugs up when its idling an see if all 4 r getting strong spark.

 

[jambro]

My 97 rs did this i checked everything and it turns out it was the fuel pump wasn't putting out enough pressure give that a look

 

[volcomsnow245]

Well I changed the spark plugs and noting changed the idle is still terrible and missfires at idlle. How would I take the wires off as it's idling will I damage something?

 

[Nasty Dream]

Well I changed the spark plugs and noting changed the idle

Are you certain you gaped them correctly?

Has this problem gotten progressively worse over a long period of time?

 

[volcomsnow245]

Yes I gapped them .28 and its stayed the same.

 

[Nasty Dream]

I mean, what kind of juice are you getting to the plugs?

I was just going to suggest something simple like replacing the 18 year old ground wires with something thicker. And add ground wires to a couple of other things. Total cost would be about $30 at worst if you hit up walmart for 6 or 4 gauge copper wire and lugs and cut them yourself.

At the very least, it will help, and give you something to do while you wait for answers from the pros.

I know you're supposed to replace ignition wires like every few years. Can't imagine ground wires would fair any better, especially with all that corrosion they are subject to.

 

[volcomsnow245]

which ground wires because my battery ground is in very good condition and my lights don't dim.

 

[scott90gsx420]

I also have a ""misfire"" Im starting to think mine is from either a bad injector or more likely a boost/vacuum leak as my wideband jumps lean when it ""misfires"".. It does it pretty consistently at idle or if im revving at a light or when im decelerating it does it too.. But cruising and boosting it doesn't do it that i can notice.. My lights dim when blinkers are on and stuff so im going to add a few grounds and see if that helps any advice is much appreciated..

Sorry not trying to thread jack just need help also and figured id just add it hear and follow the thread..