bronco 2 won't run.. got fuel ,spark and air

i have a 89 b2 2.9 it only runs when i stomp the pedal constantly but it will idle if i play with it just right. got 40psi at the rail. tested the ign. mod. has new plugs cap n rotor. swapped ecu (matched all numbers) tried unplugging sensors one by one... any ideas??

have you tried changing gas filter? maybe it's not getting enough gas or plugs may be fowled with gas or oil.

no. but i have gone as far as hooking up a fuel cell after the filter just to check if it was a fuel volume problem. the plugs are new but now that you mention that i mite have slapped them in b4 i gapped em. i bought this bronco2 as is and it was said to need injectors and a high pressure pump. i swapped out the injectors but this 89 does not have a high pressure pump. i did hook one inline were the filter goes to try this theory but nothing.

Take a 12 volt test light and put it on the coil negative when somebody is trying to start. You should be getting a blinking light if it is dim the pickup in the distributor is probably going bad.
Also check the ground wire by the computer a loose ground will cause type of problem.

Have a 1990 Bronco II, 2.9L. 107 K miles. Been sitting for about a year. Changed out plugs, put 5 gallons with lucas injector cleaner, 1/2 bottle, but can't get it to start. Any suggestions?

Use a can of starting fluid spray into throttle body and if it starts you have a fuel problem. Check a spark plug for spark ground it with insulated pliers holding against the block.