Runs good from cold, but once warmed up it has a flat spot just above idle when I give it some throttle. When pulling up hill at low revs {1500-2200} it jerks and won't pull cleanly till revs get up.

SOURCE: 76 volvo 240 car idles and low speed is rough,

It could be the filter. Has the fuel been changed after storage? I would also thing the Carburetor or the fuel injectors might need to be cleaned.

SOURCE: Starts O.K. Lacks pulling power. Will not rev to full power.

check for a clogged exhaust look at catalytic converter it could be stop up.

SOURCE: Flat spot on acceleration

The fuel injector nozzle is partially blocked.Add fuel additive to clean the injector nozzle

SOURCE: 06 f-150 5.4L low idle code and warm ac at idle.

should idle around 700

SOURCE: saab 9-5 need to give alittle throttle for cold engine start

the idle air control valve may be bad or just needs cleaned out. idle air control valve acts the same as a choke. if it is messing up it will cause engine not to run right.