My Buick is giving erratic run conditions when the car is shut off a minute or two and then restarted. Hesitates like a good old fashioned carboned up carburator. Only thing is, I'm fuel injected.

In recent days I have changed plug wires, plugs, fuel filter. The car has a "distributorless ignition". No engine fault codes showing. Any idea what the solution could be?

Thanks

 

Check the links and posts in my signature file below for starters.