1987 Chevy S-10 Hard to Start will not Idle

Is this a 4.3 or a 2.8? Look for vacuum leaks. If you crack the throttle will it idle and start easier? what is the fuel pressure? IS the spark bright blue or orange? Check engine light on?

Is this a 4.3 or a 2.8? 2.8 Look for vacuum leaks. No vacum leaks. If you crack the throttle will it idle and start easier? NO what is the fuel pressure? 11 PSI. IS the spark bright blue or orange? Blue Check engine light on? NO

I have replace ECM module, The IAC module, and water temp sender.

I have noticed motor still hard to start... but has idle and throttle response when vacum hose to map sensor is disconected.

Thanks for you time & help.. RobertV