Review on HiVehicle 12622441 Performance Automobile Chevrolet by Joseph Anderson

Used these to replace Delco AC spark plugs which had about 70,000 Car used to run fine but found the car needed a new set of spark plugs. AC Delco connector removed and theses inserted. When I first started the car there were no problems and it worked fine. After a 50-kilometer ride, I noticed an "absence” at idle and engine sluggishness when accelerating. I reluctantly pulled them out and plugged the Delco power cords back in. The car runs normally again. Bought a new set of plugs (back to AC Delco). I do not recommend buying these. They hadn't driven the available naturally aspirated car for a week when it rolled off the assembly line that day. I would return them but they don't have a return policy so I wouldn't buy them at all.