Thanks guys
been off the grid for a while
finally we did solve the problem by taking a wild shot of replacing the injectors and all was well, after
on inspecting the defective injectors we notice they were cloged with residue of a rusting gas tank
the fine strains of particle managed to by pass the intank pump filter and after a perioid of time cloged
the injectors .. they couldn't keep up with fuel delivery
did a fuel tank repair also replaced pump and flush the fuel lines..
Thanks for the support guys