OK, need some more help... I replaced the thermostat and the new cold start switch. Got everything put back together, fill her up with coolant and started her up. Ran for a few seconds sluggish, then the RPM's went to 2,000 running high and strong. Hit the accelerator a few times to see if I could bring them back down to no avail. Turned the engine off and now it won't start. Turns over but no engine engage. Unplugged the new cold start switch, still no luck. Just turns over and over....any ideas?