skipping on deceleration?

[drgerry]

96 GMC 6.5; 275K

Love my truck, but don't drive it much anymore. Last few times I took it out it would occasionally skip (kick - sputter) but only on deceleration. Seems to do it more when I accelerate hard then let of the throttle.

If I put it in N and coast, it quits. If I give it a little throttle it quits.

Doesn't skip at idle, or during acceleration (still has good power).

PCM going maybe? It's been several years since I replaced it, although it's on a heat block.

Any suggestions as to where I should start? Never had this before . . . . I'm at a loss . . . .

[Robyn]

Hello
Welcome to TDP...

Has the check engine light come on ???

If the light has been on get the codes.

If no codes showing then the PMD (MOUNTED ON THE COOLER BLOCK) is a suspect.

Any other anomalies ????

Make sure all the battery cables (both ends) are clean and tight.
Check the voltage at both batteries... both need to read the same.

Should read about 14 volts with engine running.

Voltage anomalies can cause issues....

[More Power]

I'd also recommend spending some time in the following forum topic thread on "Stalling".
https://www.thedieselpageforums.com/...ead.php?t=2938

A lot of what is mentioned there will apply to your situation.

Jim

[ronniejoe]

This can happen if the FSD is failing.

[More Power]

If this truck is a 1500 series, the problem could also be related to some failure or poorly performing component in the EGR system.

[trbankii]

I was recently experiencing "hiccups" and stalling. Pulled the MAP sensor and charge temperature sender, cleaned them both with MAP sensor cleaner, cleaned the electrical connections, coated the electrical connections with dielectric grease, installed them and plugged everything back together, and haven't had any issues since. Something to try before going too deep into PMDs and such.