I have a 283 small block in my 1991 Chevrolet s10... For some reason i can not get the idle under 1500 at idle.. I have a Spacer in between the 600 cfm holley carb... And i believe the timing is set right.. i just cant figure out whats goin on.. I have msd 6al ignition box, msd wires, msd blaster coil.. help me if u can please.