has large and small evap emissions codes in computer
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2000 Ford Mustang Question: 40-45 mph car jerks badly stomp on gas straightens up has large and small leak
Evap codes will have no relation to how engine runs...probaly a differant issue causing jerking....more like a ignition missfire more likely.
Answer #2mdeautomotive April 27, 2012, 22:49Enthusiast
At 40-45 mph this vehicle may exhibit such a jerk when it is time for a tune up. At this cruising speed egr flow is present and can overwhelm a weak ignition system causing such a symptom. Don't skimp on parts. Do a major tune up. Check the fuel filler neck for cracks or excessive rust. Take off the gas cap and check in the filler neck. Also check gasket on gas cap for cracks.