plug change?????????

[lasers78]

I recently checked a spark plug that were AC Delco R45TS gaped at.045 and saw that they had a white or grayish color on them so I decided to change them and go with Autilite Platinum AP26 I also gaped them at .045. After I was done I took it for a test drive and I could feel a little bit of a miss or stagger as I accelerated. The wires are older but they worked fine before. Is it the plugs I used?

 

[1981coupe400ci]

did you change the plugs 1 at a time to make sure you didnt mess up the firing order on the wires?

 

[Gary S]

HEI wires are very touchy. Usually, if you mess with them after about 50K miles to change plugs or move things around, you damage the wires and get a miss like this. I always try to change my plugs the first time at around 40K miles or less so the wires survive the second set of plugs. Then the next time around, I replace both the wires and the plugs and start over completely.

 

[CorkyE]

Had the same problem on my pickup truck after changing to platinum tip plugs. Popped the hood one night and an electric light show was going on under the hood. I had recently changed wires but they didn't take kindly to the yanking and twisting when I replaced the plugs.

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79 Z28 Bought new, honeymoon ride, same wife, same car.

 

[lasers78]

I changed each plug one at a time so the order is right. The plug wires are old anyway so I think I'll change them too. Any suggestions on wires???

 

[lasers78]

I changed each plug one at a time so the order is right. The plug wires are old anyway so I think I'll change them too. Any suggestions on wires???