Ive done some thread searching but could not find the right or postive answer to the right spark plug to get. When I took the truck to my tuner about a year ago he said never to get IR or hotter plugs. So I got the cheap auto lights one heat IT range cooler. I have a after cooled V-1 on the truck with a bunch of other mods. I have bad hesitation when just lightlen steping on it,and it stumbles from time to time. Under WOT its fine at least thats what I think. I did see in the older threads that auto lite and bosch are the worst to run. Why didnt my tuner tell my to changed them out before i ran them????
Any ways can some one tell me what i should use along with the brand name and part number. Thanks John

 

Sorry frogot to mention its an 2001 5.4L SOHC engine

Just checked on L rodder a Lot of those guys there Like to run with the NGK TR6 gaped at .035 for up to 10psi. What does any other blower person think?

 

I have used the Denso IT20's and NGK TR6's at .030. Good results with both. Densos are overpriced, imo.

 

I run the NGK TR6's on both my trucks and no complaints here

 

Cool guys thanks for the great input. I recognize the Auto lite #103's as the ones I installed in the truck a year ago. I wonder if I gapped them incorrectley? I think I gapped to .035 but not positive. So the NGK TR6 is a regular plug right and if it has a IX its an Ir plug so there are 2 varients of the TR6 ? Im just trying to do what my tuner Jay said to do in the past and not run hot plugs. Im sure there is some kind of reasoning behind this. maybe it has something to do with his tune. Nonetheless thanks a million One low and Tarajerame. John

 

no problem man, also JJ@WMS has the TR6's for the best price I've found

 

I run the tr6's in mine and never had a issue, ~17bucks at O'reilys . I experimented with a set of NGK race plugs for a while they seemed about the same as the tr6's.