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I have 2007 4 stroke will not run properly, Either cuts out at 20 MPH and surges at idle Check engine light comes on.

Sometimes won't go over 30 mph. This seems like bad spark plug. No check engine light with this problem :

No trouble with sled last winter 550 miles. Problem started when dealer did updates and flashed the computer with updates.

Is anyone having similar problems? Please contact me [email protected]
 

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I have 2007 4 stroke will not run properly, Either cuts out at 20 MPH and surges at idle Check engine light comes on.

Sometimes won't go over 30 mph. This seems like bad spark plug. No check engine light with this problem :

No trouble with sled last winter 550 miles. Problem started when dealer did updates and flashed the computer with updates.

Is anyone having similar problems? Please contact me [email protected][/b]
I've worked on fst's since they came out, ? when the engine is running @ idle, what does the speedo read(digital guage)? If it goes from 0 to 1 or 2 then back again, your speed sensor could be faulty.
 
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