1989 suburban.. please help

1989 suburban.. please help
- #1

Krisburb , Today 6:31 PM
First,.. New guy.. Hello and great to be part of this site..
second... Please help!...89 burb, v1500, 5.7.. New parts: fuel pump, distributor, coil, spark control module, map sensor, temp sensor, EGR valve... Checked timing, fuel pressure, TPS, temp.. All checked perfect... Idles and revs perfect.. Problem lies when put reverse or drive, bogs down, sometimes misfires.. Put back in park, runs and revs fine... Also bogs with a/c on.,... Running out of ideas and parts to replace... Can't figure why it can't handle any load, but runs perfect in park.. Thank you for any help.. Kris

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