97 express van 1500 5.0 vin#M having trouble starting, staying on and hesitates.

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Hello and thank you all for helping. I have changed fuel pump, all spider injectors, complete distributor, cap, rotor, spark plugs, throttle body cleaned, plenum cleaned and new seals, engine has great compression and its on correct timing. I changed the TPS sensor 9-4-14 and had to put original back because it seemed it was worst. If I rev the engine its good / strong but I remove my foot from the pedal and stalls. Difficult to start again but does turn on and chokes. There is no codes. My next step is checking the grounds by the thermostat housing and coolant sensor which does not make sense but has corrected others for what I have read. Thanks again