My 91 245 67,000 cranks over, but won't start until I give it gas then it stalls out unless I hold the pedal down. It gets worse when the weather is warmer. I'm getting codes 221, and 323. I've replaced the in-tank fuel pump, strainer/sock filter, sending unit, main fuel pump, fuel filter, o2 sensor, timing belt, cleaned fuse terminals, re soldered fuel pump relay (the white box pass side), cleaned battery and coil terminals, changed spark plugs, plug wires, cap, rotor, swapped with a good air mass meter (from 87 240), changed air filter, temp sender (the one that works the gauge), checked all hoses and wires in the engine compartment for leaks and cracks, cleaned the flame trap, dry gas. Any ideas what else it could be?