Originally Posted by bm1253
...turns over just fine for a few seconds, then just spins (kind of a highlining type sound)...
I'd be having a look at your starter/starter bendix, sounds to me like your starter is not staying engaged or is otherwise slipping after a few rotations (when the starter is getting hot).
When I first got TWE, she would start great when the engine was cold, but after driving a while and stopping for fuel, the starter wouldn't work right until everything cooled down enough. (I know, not quite
the same thing, but...starters can do strange things as they start to fail.) My issue was resolved by rebuilding the starter.