Got my truck out of storage and after taking care of mouse problem down carb, got it running pretty good. The only thing I noticed was it surged 200-300rpm and then would drop back to a steady 900RPM. Went to start it today and I could hardly keep it going. Had to keep it at 1500 RPM or it would stall. Ran real rough like it was firing on 5 or 6 cylinders. Might be broken valve springs, bad valves,jumped timing chain, fuel problem I don't know and here's the clincher. I've got a herinated disc in my back and I can't bend over anymore to work on the engine. Can't even pull my plugs. The engine would backfire from both carb and exhaust at a high idel of 1500RPM. I know there nothing down intake from the ground up mouse and the carb looked pretty good after cleaning it. It ran good yesterday, but not today. Any Ideas?