If it had ethanol in it when it was parked, it's likely all rotten and nasty.
That's the problem with running stale ethanol like this, that once it's run through the engine it tends to make the valves stick, sometimes resulting in bent valves.
Worse, the warmer you get the engine, the worse it'll be once it cools.
Ethanol blended fuel has a maximum tank life of @ 3 months, after that it gets acidic and starts to break down.
Its as close to the old mythological wise tale of "sugar in the gas tank" as you'll get.
Old non-ethanol fuel can also do this, but has a much longer life than ethanol and tends to plug up the whole fuel system rather than sticking components.
The fact that the car won't idle in gear also indicates a possible vacuum loss due to valves hanging up or bent, basically a large vacuum leak.
Check all the vacuum operated accessories for leaks, too!
Also look for bent pushrods.
Rebuild the carb, replace the fuel pump, totally drain the tank and run a high quality fuel with some cleaning additive in the fuel, along with a tune up.
IF you didn't already bend a valve, or pushrod, it may run out of it over time with clean fuel.
Mark.
