if i may add my 2 cents here...ebo it may very well be a clogged exhaust. on my 90 it got clogged and when it idled it sounded great but when you were driving you could feel it working harder and there was a visible drop in power. replaced exhaust and car ran great. they do make a pressure guage that measures the amount of pressure coming out but never saw or used one. if the exhaust system needs changing you may be able to fix your problem easily.

Can you hear it at idle? I had a chirping noise once and it turned out to be a dry water pump bearing...bearing full;y wiped shortly thereafter, but this wouldn't contribute t a stumble...

Can not hear it at idle, days before resistor wires you could hear the RPM thru your radio. Well going down the road it's just like that but it's a chirping sound and it matches the RPM.

[QUOTE=ebo]See now this is why nobody joins sorry off topic, refer to first sentice) was running my 3 yr old troy built power washer with a 5 hp Honda engine. [/QUOTE]

The value of off-topic:  In the 70's I wanted a troy-built tiller so bad!  That's all they made.  Couldn't afford even that toy.  But I saw your post today and searched on Troy built....  whole new world of goodies to look at so Thanks Ebo!

[QUOTE=eldredjames] [QUOTE=ebo]See now this is why nobody joins sorry off topic, refer to first sentice) was running my 3 yr old troy built power washer with a 5 hp Honda engine. [/QUOTE]

The value of off-topic:  In the 70's I wanted a troy-built tiller so bad!  That's all they made.  Couldn't afford even that toy.  But I saw your post today and searched on Troy built....  whole new world of goodies to look at so Thanks Ebo!
[/QUOTE] Glad to help just to update you Troybuilt went out of buisness MTD bought the name, and Briggs and Stratten is partners also. Only thing troy built is the sticker!