well were gonna see if it likes the delcos the 3.1 didn't seem to like the plats. last w/e put fresh wires (210k on originals) and some boch plats my gas milage actually went down.So, today I swapped the plats for some ac delco standard old schools gonna take the ol gpse for a milage run and see if we get back to high 20's some cars likem(plats) some don't