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1991 calais backfire through carb...
Howdy!
1991 Cutlass Calais. 2.5L carb. Automatic tranny. 217K miles. Purchased a couple months ago. Last week started backfiring through carb when accelerating hard or (PUM! then hesitates, sometimes stalls). Always starts great. Never a problem with starting. It runs great other than this problem. I drive it to work every day (no freeway, speeds up to 45). I have also noticed that if it's accelerating in D it seems to do it more than in 2nd when at lower speeds.
The SERVICE ENGINE light is not on. There are no codes in the computer.
I disconnected the O2 sensor and it made no difference.
Any help very appreciated, as I know basics about carbs and lots about FI, but nothing about these electronic carbs with O2 sensors.
Thomas
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