One of my 96 D1s .

I had been struggling with my "high mileage" D1 for the past few weeks after she came down with a bad case of rough idle, misfiring and stalling shortly after start up.

The idle problem started after the starter went out and was replaced.

First thing I did was clean the IACV- it was full of oil and hardened deposits. Once reattached and started the idle problems still existed- the vehicle was basically undrivable since it would lurch at speeds below 20mph and the engine would stall out at every stop sign.

I then replaced plugs/wires and O2 sensors- no difference in engine performance.

Then I got a new IACV from the local parts store with knowledge from this forum that I could use an IACV from a Jeep vehicle- $60. Once attached the vehicle still idled radically up and down. I put my original IACV back on.

I tightened my throttle cable thinking I needed more air to keep the vehicle from stalling- huge mistake.

Robertf then replied to my cry for help and advised me to reset the adaptives with the help of his GEMS app. That reset made a huge improvement in idle stability, but I still stalled out while in park after a few minutes in my driveway.

I then added the stack back to my throttle cable and began swapping the new IACV with the original. After adjusting my throttle cable to have slack I noticed that the vehicle was suddenly stable at idle in park with the new IACV vs stalling with my old IACV.

Problem solved.

No stalling at stop lights and I drove her to work doing 70 down the hwy.

It's possible I had a stuck IACV all the time but didn't notice without resetting the adaptives first. A big mistake I made was going down the road of trying to adjust the throttle cable to account for the engine stalling.

Thanks to all who have advise.

Brian

 

Excellent. Thanks for the recap. Good looking truck. Nice and clean.