I had my stock plugs swapped for NGK TR-6 plugs and I noticed on the drive home that my engine ran very rough! The shop was closed by the time I got home so I didn't get a chance to ask what was up. Surly this isn't normal. Comments?

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Update:
Well after all is said and done I have to say thanks to the folks at LoneStar Performance in Garland, TX. I took my car to them for a couple of things. One was the plug swap. After I noticed the rough running, I went back to them. They removed the plugs that they had just installed, plugs I had purchased from a different vendor, and re-installed a new matched set along with replacing the stock plug wires for a lower resistance set.

Car runs great again! They didn't give me any smack about the plugs or the fact that they had to swap them out. They only charged me for the plug wires and a nominal fee for installation. All together less than $90. Of course the fact that I had just cut a check to them for over $4,000 for the plug installation and a new Moser 12bolt installation could have led them to be generous, but I'd prefer to think that they are customer oriented and I will be back for more!

By the way, if you are looking for a replacement rear-end, the Moser 12-bolt is suppose to be bullet proof, but I can say from experiance that you will never say it's a quiet rear-end on the road.

 

check all plug wires and make sure there on there good.......

 

Double check plug gap and to make sure the porcelain did not get cracked on installation.

 

what i was going to say, make sure the gaps are all the same. I had that problem once and regapped plugs and problem went away. But also very possible the porcelain could be cracked, seen a brand new set of tr5's straight out of the box with one cracked.

 

You are going to want to gap the plugs at 35 ( which is what the gap should be out of the box ).

-Chris

 

thanks for the input. I'm taking it back to the shop friday. If i'm lucky, i can get off work and work with them to identify the problem. I'll take these recommendations with me.

 

my car doesnt like the ngk's. autolite 103 would be a similar plug.
mine would run good wide open, but stumble while cruising.
tried a couple sets and gave up.
ill never go back.

 

I had the same issue.
2 sets of tr-6's and both ran rough at low rpm's.
I put in a set of Zex plugs and they work good for me.

 

bump!