My '90 240 has decided to no longer run. It starts, idles fast and stalls. Tune up is done, replaced the vacuum lines to the throttle body. It is not misfiring at all, starts right up, new fuel pumps. filter.... I'm at a loss

 

Clean the Throttle Body and the Idle Control Valve.

 

check your rubber lines from the tank to main pump. They can be cracked and suck air. i know you would think it would leak fuel but not always the case.

 

Vlad, try disconnecting the AMM and starting it. If it keeps on running then the AMM is bad. Make sure the replacement has the same part number ( probably ends in -16).