I have a 2002 ranger with 2.3 engine, 73,000 miles. Engines runs perfect at idle, very smooth. When accelerating, the engine surges and bucks. Worse with a/c on. Also surges at highway speed. This is what I've done so far:
Cleaned, throttle body, iac, mas, added fuel injector cleaner to tank, checked hoses and intake for vaccum leaks (used propane bottle) changed air filter, plugs look good.
Oh and no codes are showing. What else can I do? Thanks in advance
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