[93buicklesabrelmtd]

Ok, she is still driving great, just a little bit sluggish lately. Im thinking I need some new plugs and wires since this has'nt been done in about 2 & 1/2 yrs. I drive about 80 Miles per day on the highway, a little more on some days, everyday!

This problem started about 2 weeks ago, and has gotten more notice able since then.
Problem seems to be load related! Car upshifts and downshifts just find to me. But say I am going up a slight hill, she does a little jump/chuggle right at the base of the hill. It only does it on a hill, espescially if im bumping the AC it will do it on slight inclines.. Once she does the little jump its doesnt do it again. This lasts about 3-5 seconds. Last night it was dark, so I noticed that when it did that jump, my RPMS jumped with it. Not a big jump but from 1400 RPM to about 1600RPM then back to original RPM it was at.

If I have the heavy foot up the hill, she shifts fast and smoothly, so im definetly thinking load.

I dont think this is tranny related, but then again it might be. But why would she run just fine with the AC off, or on a smotthe surface?

Is this and ignition problem? or plugs? maybe fuel?
It had a new fuel sock put on last yr, but still original pump, and why would the pump work good at all other times?

Tranny has a new Modulator valve on it, and it seems to be working just fine, It has nice shifts.

I do all my maintance work, just been doing oil/tranny changes and she been working great, but it may be time for a major tune up or something. Please help guys!