282GT308LX

.....02 GT....bbk headers, prochamber, flowmasters, K&N FIPK.....then I decided to go ahead and put new spark plugs in it...I bought bosch plat. 4's, and now if I drive at a STEADY MPH....around like 2,000 RPM n a lil higher....it will hesistate and shake slightly....accelerating s no problem.....I dont think it did it before these spark plugs and I dont kno if they are defective plugs, or I shouldnt use bosh plat. 4's...I heard that somewhere....HELP

282GT308LX

No ones ever used bosch 4's?

code3GT

Bosch's SUCK in 4.6 Mustangs. NGK's for the win.

282GT308LX

how about split fires????I heard these are great....supposedly whats NGK's best plug?

code3GT

For a N/A 2V 4.6..get copper NGK TR55's.

282GT308LX

GREAT Thanks bro!

gary96gt

only thing Ive heard about the bosch's is that the extra tips on them can break off. Actually had that happen to a friend, no engine damage but Im sure you can imagine what that could do to an engine...

qbuswell

I had the same issue with the Bosch 4 plat. I took those f-ers out and put brand new motorcraft ones in and everyhting was perfect. They might be great plugs but not on the 4.6 stangs.

SOHCtimes2

NGKs are FTW in every kind of car! lol

SpecterGT260

thats good to hear. my local speed shop just sold me a set of nkgs that were 2 steps colder for my nitrous. I just trusted them