if the gap is too large it can make a weak or no spark condition witch can create a misfire. on the other hand if the gap is too small it can reduce the heat of the spark significantly witch can also create a misfire. both conditions may also result in fuel fouled spark plugs.
If not gapped right your car might start shaking, or even stall or worse no star.
Maybe when they put the spark plugs in they were not gapped right or they maybe the wrong spark plugs.
The gap needs to be checked before instillation.
most spark plugs should be checked and gapped annually. if your spark plugs are used up you should replace them
I put NGK iradium pre gapped plugs and they work great.
The spark plugs should be gapped to .040 inch.
They should be pre-gapped when you buy them. The gap is .031 to .035. Open a package of plugs and you will see that they are not "pre-gapped" but vary widely in a set.
Autolite 3076 gapped to .025
the stock spark plug is the ngk ifr6l11 gapped at 39 to 43
New spark plugs do not necessarily come already pre-gapped for the application. Remove the spark plugs and gap per specifications. If you are not sure what the gap should be, call the auto parts store where you bought the plugs and ask them.
Yes spark plugs must be gapped to the vehicle specifications. Different vehicles call for a different gap.
The spark plugs on a 1993 5.2 L should be gapped to .035 inch.