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Vehicle is a 1990 Buick LeSabre. Ran great for a while. Occasional minor drop in idle but nothing concerning. Recently engine would stutter when giving gas at 45 mph+. Maybe twice during a 20 mile trip. Been like that for months. Here in the last month it idles rough more often. Acts like its going to die when accelerating from stop. Does die when using reverse 75% of the time.
Added fuel treatment, no help. Plugs and wires replaced less than 7 months ago.
Unplugged Mass air flow sensor and ran it down the street. Still acting as before.
Here's the codes I got from auto store.
GM 21 thru 26
GM 32 thru 35
GM 41
GM 43
GM 66
Im going to attempt cleaning the resistors on the Mass Air Sensor by dripping some rubbing alcohol on them.
Any help much appreciated!

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Location: Oregon
with all those codes I would look to see if your 5 volt reference was correct. However, how many of those codes did you set by unplugging things? you may have to clear all the codes first and then see what codes come back when you drive it.

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