tet6419
08-20-2007, 12:15 PM
i have a 1995 z-28 with the lt-1 engine. The engine starts and runs fine until it gets up to operating temp. and then it will spark knock and backfire at low rpm up until about 2500 rpm then clers up.Fuel pressure is 43 psi at idle and there are no codes present thanks in advance for any tips.