I just bought a 99 z28 6m I have a dead spot in the throttle So far I've cleaned maf, new fuel filter helped , I bought tr5s will these work well? And is .050 the gap it only has Kn filter.

 

For that big a gap or the stock gap I would have gone with TR55s. Opening up a TR5 to that gap gets the ground and center electrode out of square. Need a data log with the dead spot to see what is going on.

 

I can swap them out for 55s tomorrow but what do you recommend for the gap?

 

I have always run them at their out of the box gap of .059. Others may tell you to gap them smaller. I believe coil on plug and short wires have no problem firing that gap. There are times you might want to run a smaller gap but that is usually with a colder plug too.

 

You might find this thread on LS1 spark plug specs and gaps useful:
http://www.ls1.com/forums/f6/spark-plug-gap-93238/

And a related thread from this site:
https://ls1tech.com/forums/generatio...-plug-gap.html

 

My tr55's out of the box were gapped at .055. I just left them there.