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-   -   350 Mag rough idle (https://www.offshoreonly.com/forums/do-yourself-boating-budget/326081-350-mag-rough-idle.html)

BUP 05-13-2015 02:52 PM

Post your fix when done.

JayFan 05-15-2015 03:13 PM


Originally Posted by BUP (Post 4303814)
Post your fix when done.

Well......new battery, and ran some injector cleaner directly through the fuel filter and the regular tank....and no luck! Any other suggestions, before I bring it to get scanned later tomorrow..... this one has me stumped!!! uggg!

man-of-war 05-16-2015 04:47 AM

Double check your Plugwires, cap and rotor, I installed MSD plug wires last tune up and only noticed the rubber insulator hugging the 8 vertical terminals on the cap were to long and had pushed it's way back off the CLICK terminal.

BUP 05-16-2015 10:48 AM

You still have the warning horn going off ?

BUP 05-16-2015 10:53 AM

What spark plugs did you install - brand and number on the spark plugs ? AC delco 91- ???

did you gap your new plugs ? Some spark plugs you do not touch the gap because it can cause a miss fire. Double platinum tip spark plugs you do not touch the gap.

JayFan 05-17-2015 07:20 PM


Originally Posted by BUP (Post 4305106)
What spark plugs did you install - brand and number on the spark plugs ? AC delco 91- ???

did you gap your new plugs ? Some spark plugs you do not touch the gap because it can cause a miss fire. Double platinum tip spark plugs you do not touch the gap.

Well........good news it is "appears" fixed! I believe it was a combination of a partially clogged injector AND spark plug wire INSIDE the boot broke off, and was very loose on the plug. Runs just as good as the other engine now on the muffs. True test will be first run out, in a week or so. Crossed fingers!!!!
Thanks for everyone's replies.......


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