Need some help diagnosing - here's the issue:
(bianchimatic with a 14:9sha)
It'll start and run strong for about 2 miles - can reach 25mph wot
Idles ok at stops but at about the 2 mile mark it'll start to struggle at stops, and will stall if I have to stop around 3 miles.
If I let it sit for 5 minutes , it'll start back up and run again...only a shorter distance if I have to stop.
However if I can stay above 10mph it'll run strong. Only problem seems to be when I come to a stop.
Initially I noticed that the fuel line was empty when this happened so I thought vapor lock. I put different gas cap on, even ran without a cap for a bit, then tried a new fuel filter. Same issues. Then I took out the filter altogether - same problem (except without the filter I noticed the fuel line wasn't empty).
for what its worth, the spark plug was new in the fall and hasn't had many miles on it yet. still, could be something...?