In the 1989 Blazer I just bought, it's got a 383 with the stock fuel injection system. It always runs hot. It doesn't overheat, but it runs up to about 250, then the t-stat opens and it drops to about 200. It cycles back and forth like this. Any suggestions on how I can get this to run at a fairly constant, correct temp? Anyone else run into these problems with the 383? Thanks.