Please Help - ’88 5.0 auto starts & idles fine, but stalls when put in drive

[richstang]

Car starts and runs fine in park or in neutral. It also runs fine when put in reverse.
When put in gear (overdrive) it will shudder & stall (but not every time).

If I restart it & put it in drive - low gear 1, it doesn’t stall and runs fine. I can then shift into drive without issue, and again into overdrive and it will run fine.

Any ideas what may be wrong?

Thanks,
Rich

[richstang]

Put the code reader on it and got a bunch of codes

KOEO; 82 & 34
KOER; 94, 44, 33 & 13

Pulled the EGR and it was clogged full of gunk. I clean it out and the pin tip of crusty build up.
Drove it twice with no stalling when put in drive...one was 40 mile drive with no issues and it restarted fine for my return trip home.

I need to pull the codes again to see what is left to look at, but at least I'm on the road again.