86stanggt5.0

Can Autolite Platinum plugs on a 86 mustang gt 5.0 ho cause rough idle? should i got back to bosch plugs?

91stang

platinum aren't made for performance

i had a friend who wanted to get his car dynoed but the shop told him to change his platinum lugs before he could

2 kwik

I doubt it....why bother with plat. plugs you gain 0 horsepower they do last longer and tend to help up faster..thier good points

86stanggt5.0

ok thank you also can bad grounds cause rough idle and make in run rich?

Archion

Haveing sold them for a # of yrs, you have a 50/50 shot of your 5.0l even liking the platinum plugs, not the tipped, but the full core plats. They do not heat up evenly enough for the 5.0, the core heats up way before the rest of the plug, your better off with a copper core.

86stanggt5.0

thank you i will try some regular plugs then thanks alot

samseed101

I had platinum +2s in my car for about 1 month. Finally had to rip thgem out and throw them away. The spark was blowing out under pressure and just plain sucked. Switched to copper and haven't had a problem since.

As far as running rough, it could be any number of things. Have you cleaned your IAC and TB? Check for any vacuum leaks? Does it hesitate when accelerating? What does it idle at (for RPMs?)

88blackgt

anyone had any experience w/ the bosch +4s? i had a friend that used them in his pony and liked them alot. wasnt sure if anyone else had an experience w/ them because from what i hear they suck *****. i was gonna put some in my dd to get a lil more gas mileage maybe

2 kwik

I don't understand why people pay good money on anything else but a reg plug....it you want more spark at the plug then buy a set of low ohm resits wires

Pure5.0

I have platinum autolites and never had a problem....bosch will give you more problems than autolites though.....I have had bad experiences with them.