Spark plug Bosch or AC DELCO

That's what I am running in my wife's 94 and the idle in her car is real smooth...

I run the F6DTCs and have great results with them

I've run NGK BKR7E's, NGK BRK7IX's, Bosch FR7LDC, and Bosch F7LTCR's. Of all of these plugs I noticed the best performance out of the F7LTCR's.

I switched to a Bosche plug F7LTCR $4.41 a piece from rockauto.com. They last 4 times longer, and run much better than the BKR7 series.

Bosch FR8DS plugs are stock aba (2.0L 8v) plusgs and are awesome.

VAG engines seem to like their factory recommended Bosch plugs better than any other.

You do know that a bosch "7" is 1 range HOTTER than stock and 2 ranges HOTTER than a NGK"7"

Platinum +4s are the worst plugs you can use. They have a bad habit of losing tips into the cylinders. I don't think I need to explain the results of that.

i've got some bosch silvers...and this happened after about 12k miles and currently (3k miles) later i'm getting similar symptoms as before.

I have a strong opinion in not suggesting the Bosch or the Beru. There is a reason that BOSH is no longer the OE spark plug in VW, Audi, BMW, Mercedes Benz etc., etc... Stick to the NGK, especially in a VR6, NGK has been OE since the intro of the VR6 six months after Bosh failed to produce a plug that would run in these engine during start up. The Bosch had nothing but running problems.