To my mind, your problem could be one of:
1. Air filter needs replacing. Try running it for a while with the filter off to see if it's fine that way.
2. Fuel starvation. Possibly pump related, could also be down to a blocked breather. Try running it with the filler cap off to eliminate a breather problem.
3. Electrical. Do you have a check engine light on and have you tried running any diagnostics?
One thing I'm still not clear on; when you have the problem, does the engine sound fine but need a lot of revs to get going or does it sound rough?
1. Air filter needs replacing. Try running it for a while with the filter off to see if it's fine that way.
2. Fuel starvation. Possibly pump related, could also be down to a blocked breather. Try running it with the filler cap off to eliminate a breather problem.
3. Electrical. Do you have a check engine light on and have you tried running any diagnostics?
One thing I'm still not clear on; when you have the problem, does the engine sound fine but need a lot of revs to get going or does it sound rough?
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