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Check your TPS TPS = throttle position system
Replace the PCV valve. If that does not cure the problem check the EGR valve.
144 hp @3200 rpm + 280 ft. lb. torque @1500rpm source: Chilton Book Company (book 6739)
Could be the EGR valve not opening and causing the engine to detonate/ping due to excessive engine combustion chamber temperature or knock sensor not retarding timing. And could be engine bearings.
We have that combination in a daycab 357 pete. Hauling grain at 88,000 (were allowed 10% during harvest season) we get 5.5-6mpg. That's bouncing empty half of them miles though. 1500rpm at 65mph.
230 ci-30 to 45 @1500rpm =283 ci-40 psi min =327 ci-40 @ 2000=409ci-min 50lbs @ 2000 rpm.as per 1963 gm manual
What kind of wound mechine is this...if it is wave wound mechine than Eg:357
Misfiring and idle at 1500. sounds like a TPS isn't adjust correctly. look on this site for a write up to fix your TPS http://fc3spro.com/main.html and to correct your Idle on top of the intake manifold there is a screw use a flat head and turn it down. that will adjust your idle if your TPS is correctly adjusted.
Have system scanned if check engine light is on. I would check for vacuum leak and if none were found do a tune-up if due. May need a fuel system check ,,,,fuel regulator, fuel injector, fuel filter. Could be throttle position sensor or crankshaft position sensor. Could be a computer problem.
to do this, you need to enter the code, then whilst the engine is running, you need to remove the fuse marked BIC/Ilum, turn the engine off and on and then replace it, the drawback with this, is that the engine management warning light will flash when the engine is running at below 1500rpm, also the immobilizer light will flash, this can be turned off by holding in the central locking button for a few seconds.
that fault can come from variety of location some that relate to the intake airflow, verify that all the vacuum hose's have vacuum.EGR VacuumTurbo waste-gate Vacuum (specially if you do not hear the whistle of the Turbo at about 1500rpm)In addition I'll recommend to clean the intake unit, I found in mine fair bit of sludge and just by cleaning it there was noticeable improvement in the way that the car pull.Hope it helps
yes it could be that but i had the same problem on mine too and it was a leak in my intake manifold gasket, it only costs about 10 on eBay and replacement is somehow difficult but it can be done, after that, everything was working awesome!!