mY ENGINE STALLS AT 4000RPM??? CHG THE GAS CONNECTOR ON INCOMING GAS, CONNECTOR ON ENGINE SIDE OF GAS, SWAPPED TANKS,CHG FILTER KIT ON ENGINE, CHG FUEL FILTER ON ENGINE, CONNECTIONS APPEAR TO BE TIGHT, PUT SOME FUEL INJECTOR CLEANER INTO A 6 GAL CAN STILL RUNNING THAT THRU AND THE PROBLEM...