check your fuel! remove the feed line and run the pumps see what you are pumping, ( pump into a plastic container) see if condensation has built up water in your system, also there is a filter just inside the fuel distributor you may have moved some trash threw the lines and plugged that little Jewel. reason I say that is that I had a fuel starvation problem on our 420, it would plug up then run very low on power and when I pulled over and shut the engine down the trash would settle then start back up into the filter as I drove. after removing that filter It cleared up. something to try.