Ok, guys. EJ25 DOHC M/T Her symptoms are: hesitates on acceleration, stalls sometimes when clutch thrown in, at idle oscillates between 700 & 1000 rpms, bucks sometimes in 2nd.

 

Other research pointed me to the MAF maybe having intermittent issues. Replaced with known good MAF, reset the ECU after install. Now she has great acceleration, 80% of the time maintains idle @ 900 rpms, stalls 2-3 times per trip (instead of 10-12), still bucks on occasion.

 

I'm curious about the ground for the MAF. I noticed it mentioned a few times in my research. With it acting up intermittently, I'm not sure how to test it. EWD looks like it grounds from the ECU. Can I not just reground it from a body ground? Can I piggyback it on a different ECU ground? Is there something else entirely that I could look into?

 

I need a solution. Stalling in the middle of traffic because some selfish spardnubbin cut me off is not fun. Granted, I often can pop the clutch and keep trucking, but sometimes I don't realize she's died and she can take forever to crank after the stall. All ideas are welcome. Thanks!

How long since it last had a tune-up?

Spark plugs and wires and filters?

 

It sounds like its only stalling when you push in the clutch, which is usually a symptom of a dirty Idle air control valve, or a vacuum leak, or an air leak into the intake tubing between the MAF sensor and the throttle body.

 

Make sure the intake tube is clamped properly at both ends, and all of the 1/2" diameter hoses are properly attached at both ends and none are split or broken. Any air that can get into those hoses without being metered by the MAF sensor will cause a lean idle fuel mixture.

Full tune up including coil about 6 months ago. Also found my driver's side header is cracked last week looking for the exhaust leak you can hear.

check engine light?
read the codes - are any pending?

vacuum leaks as fairtax mentioned?

 

idle control valve would be suspect if it's happening when you push the clutch in (presumably the throttle is likely closing at that time too)?  they routinely stick and need cleaned out.  remove and clean out or replace with a used one.

 

 

it's rare but i've seen a few sensors cause issues without throwing a CEL.  MAF and O2 come to mind, but i would guess any sensor could possibly do that?