My engine is hard to start after running for awhile. I can get it started if the throttle is WO and keep it above 1000 RPM for about 40 seconds. If I bring the throttle back to soon it dies. I have replaced plugs, coil, fuel lines and filter, and IACV. No help. Anyone had a similar issue I would appreciate any and all information. It is getting very expensive changing parts. I can't find a mechanic in the Melbourne, Fl. area with a diagnostic unit to check for fault codes. The temperature stay at approximately 170 and the thermostats were also replaced. I top the tanks off after each trip and there isn't any issue once it is running regarding performance.