Help me timing or carb issue
67 GTO original 400 complete carb to pan rebuilt and the TH 400 rebuilt with mild shift kit and installed in June this year. Just over 750 miles on it now.
Had it built with KB pistons dished.
Compression as measured by machinist at 9.3:1.
Comp cam 262
After rebuild had removed original Qjet and had another qjet rebuilt with electric choke.
30 over. New water pump, balancer, fuel pump.
new springs, cam. Heads 670 3 angle valve job, hardened valve seats.
crank reground with new bearings rods, etc.
engine was lined honed, balanced, torque plate used, turned out great.
New torque converter stock, new flex plate.
New plugs plug wires, petronix igniter II, new coil. new battery.
Originally car runs great when warm but would bog down when you get on it. Mechanic suggested a new carb rebuild, (everything else has been rebuilt) that is why I chose the electric choke qjet that could be bolted on the original intake with no modifications or adapters.
With both carbs car would start then stall after I would put it in gear this would happen about 2,3 or 4 times so I would just sit and let it warm up for about 3 to 5 minutes. I would drive to the nearest stop sign and it would stall. It is rough at idle and stall. Mechanic monkeyed around with idle and mixture setting. I would need to keep reving up in nuetral to keep it going. We ended up setting the idle high so it wouldn't just stall out. Once the car is warm it runs fine has good acceleration. Still is mildy rough at idle sitting at stop lights, although idles a little high.
My mechanic said bring it back to carb shop and have em fine tune it. But now a new problem is developing. It wants to increase idle on its own. At the stop sign the engine started to rev up a little and I didn't even need to put my foot on the gas and I was cruising up to 30 mph. Also, the initial timing is 10 Degrees and 36 final degrees. Carb shop said you may have vapor lock. Fuel line sits right on top of intake manifold. So, somebody thinks its vapor lock, one thinks it is timing and one thinks it could be a vacum problem, one thinks its the carb. Can Anybody help. Thanks Greg