My '03 450 is acting strange. Several weeks ago i was having cut out problems and erratic idle. I discovered that the fuel screw fell out. I replaced the fuel screw with a zipty screw. I set it at about 1 1/2 runs out. It starts but dies after 4 seconds. Adjusting the idle only makes it idle higher before it stops. Here is what I have done to date: 1, Cleaned Float Bowl, 2, Removed and replaced the Fuel screw tried stock and Zip Ty. 3, Replaced Spark Plug 4, Check TPS Resistance (out of spec) the resistance was at 3.8kOhms at full open spec is between 4-6kohms. 5, Unplugged TPS, (only tried to kick it a couple of times). 6, Replaced Air filter, both old and new are Twin Air filters. Nothing seems to resolve the problem. Please note I have a Rekluse clutch and stock flywheel, these have always worked in this configuration, any help would be appreciated.