Stuttering on load after warmed up

[Bradco02]

My 1987 e30 convertible when cold runs strong, after normal temp it stutters when accelerating still strong but stutters no vac leak new muffler plugs not fouled, just ordered O2 sensor but any other ideas

[It's Soda Not Pop]

Maybe the AFM or fuel related issue.

[Bradco02]

I would think if it was fuel it would happen cold too?

[It's Soda Not Pop]

Is it throwing any codes? What does the stomp test tell you?

[e30davie]

I'd question the ecu temp sensor if its engine temp related.

I'm surprised they give trouble as they should be fairly bullet proof but many people seem to have issues with them. at the very least remove the plug, make sure the contacts are good, clean them if you can to try and isolate the issue. you can test it too, ohm vs temp numbers can be found in bently manual. or probably via google.

[MrBurgundy]

stuttering is mostly related to spark issues, especially under load.

Check your CPS, along with all other spark related items.

Low fuel or fuel issues, you'd be backfiring when it leans out.

Spark.

[It's Soda Not Pop]

I had a ICV that was grounding out my harness. It would make the car buck and stutter. Also how old are some the sensors and parts? Might be time to do an overhaul for some things.
It wasn't throwing codes?

[Gregs///M]

Def suspect the AFM, it also has a temp sensor inside it.

[Bradco02]

The other day changed valve cover gasket, and while doing it fixed 3rd wire had come out of metal that snaps on to plug also 1st plug wire inside was rusted like not getting contact, yesterday flushed engine with liqui moly and changed oil with same today driving on highway after warm no stuttering but check engine light periodically came on still awaiting the O2 sensor