Loss of power

[HH Henderson]

My 360 starts and runs real good. There is no skip or miss of any kind. It sounds great with the glass packs, but this is only for a while. I was pulling my trailor with lawnmower and for about 15 miles everything is perfect. Then it begins to sound louder (mufflers), less power going up hills. There are no oil leaks..... but it sounds like a rocker arm mite be loose. However after it sets up a while, it will be OK again. It repeats this each time. Would a bad coil cause this? Any ideas before I start to work on this thing.

[HH Henderson]

Found the problem. Someone suggested to ck the choke and this was the problem. Thanks

[ToughOldFord]

I love an easy repair.
If it had been doing it for a while you might want to change your oil, there's a chance it's contaminated by the choke flooding the engine like that.

[HH Henderson]

Good thought I will do that in few days
Thanks