New spark plugs before or after BG44K clean-out?

[myf16]

I am trying this first on the family car (a Q45) before I do it on the NSX.

I plan to run a can of BG44K with maybe 8 gallons of gas to try to remove any carbon deposits in the cylinders and of course clean the injectors. The problem is that one of the cylinders may be misfiring already. Given that, should I change the plugs first? The flip side is that I don't want the BG44K procedure to foul the new plugs.

Anybody have some advice for me?

 

[jgtcnsx]

if you plan on changin plugs i would flush it first,then put the spark plugs on.

 

[W]

If it does do anything, then it is best to change the plugs after. If it doesn't do anything, then it won't matter that you changed the plugs after. Sounds like you should change the plugs after. BTW, BG44K won't survive in the cylinders as well as some other products specifically designed to clean out carbon in the cylinders.

 

[myf16]

What product(s) should I use if I suspect carbon deposits in the cylinders?