With the top up, door windows open, side windows out, and back window up, exhaust fumes are being pulled into the cab area. Even with a bikini top I sometimes get fumes. The exhaust system is intact with no leaks. I realize that the air flow over the windshield makes the cab pressure lower and pulls in the exhaust, but I'm sure others have had this problem. This is an 89 4.2 with carb. which makes it stink more than injection. Any suggestions for a cure would be greatly appreciated.