My engine has started breaking up at 1800 rpms, and has progressively gotten worse. I changed the carb from 4180C to 650DP. No change. New plug wires, no change. New MSD coil, no change. New fuel pump, no change. Now the sun tach doesn't register any RPM's until it gets past 1200 RPMs. No reading (0) at idle. UGH! I am very frustrated and cannot figure out what the problem is. Please help! The car is an 83 GT. 0.30 over exploder block, GT 40 heads with upgraded springs. TFS 1 cam, stealth. The engine was running good for about 500 miles, then it started with this gremlin. Thank you,
Mike
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