jimmy fuel problem

I need help ... 1 month ago jimmy started "bucking" .. until finally wouldn't run at all ..... 1995 4.3 .... ended up replacing regulator attatched to cpi .. ran fine maybe a little rough idle .. but has 250k miles ... yesterday started to buck again ... has 52 psi at the shrader valve , doesn't bleed down .. replaced fuel pump 3 months ago cpi and nut kit 2 years ago , fuel filter 3 months ago.. new cap rotor wires , module checks good ........... how about tps ??? anyone think that could be problem ?????????????????? body and interior are cherry and I put all new f/end parts and new exaust on this summer .. I'm determined to keep this trk ..but am aggravated ...........any help:

58-64 is required fp here.