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2G random stutter/missfire Help?

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hunt1091

Probationary Member
16
0
Apr 27, 2013
Chattanooga, Tennessee
Okay guys first post on this forum haven't had time to be on this forum since I started building this car about 2 months ago. I will start by giving you a list of whats on this car.

1995 GST
DSM link
fully built 6 bolt swap won't go into to details
HX35 external waste gated
550cc for break in I'm working on my 850s
summit racing regulator
hks bov
cheap waste gate tial is coming but taken apart to check for leaks none
New MAF
AEM wide band
ruff tune by ruff I mean someone who knows what there doing just with out the dyno for break in

There's allot missing there but that's all the relevant stuff to my problem.

Alright what is happening is I'll be driving down the road everything will be fine running great then all at once it'll lean all the way out off the gauge and if your foots in it just starts shuddering and vacuum starts bouncing around 0 and I get a stutter until I cycle the ignition then all back to normal for a few minutes then repeats it self....Now it only does this for the most part in the day when its hot, it doesn't do it so much when its cold out. I maybe missing something stupid i don't know. I know its not boost leak that would go rich I'm just at loss here I have no idea whats going on. I also have no CEL and EGR deleted
thanks for the input guys
 
Well if you have a Leak in the Intake Manifold gasket/ injector seals or the Throttle body, the car can go lean during idle. I would still do a BLT to rule out the easy stuff first. Could Be something electrical loosely connected and making intermittent contact.
 
Ya I've gone through most of the stuff I worked on it all morning and now I'm really stumped figured out finally it was a skip on cylinder 2 I go and change the coil pack there wires too even though there brand new 8mm wires....I drive down the road repeats it then I go back now its cylinder 4 dead skipping now I'm just confused because that's not even the same coil. I have no idea could an ICM some how do that I've never seen one do that.
 
Make sure the CAS bolts/nuts are tight. I had a bad misfire that most people blamed on the phantom misfire but my CAS was loose. I tightened it down and it went away
 
Alright ill look at that but don't think so because it goes away just from cycling the key

After research and talking to a few other DSM people I think its my ICM I'm buying one in the morning....I kinda bought the one I'm using from the junk yard anyhow.

Well i thought it was the problem I guess not where all am I supposed to have grounds on this motor?
 
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