Problems on the road

87 syncro westy

I've traveled over 4000km after just having my 2.1 rebuilt with new AMC
heads, clutch, exhaust  etc.
I'm in Santa Fe and I have been getting stumbling but ONLY on bumps.
I've tried all the usual things, temp2, AFM,(I have the capacitor fix) 02
sensor, all wiring..gnds...squeezed the whole wiring harness looking for
inside bad connections, I've put in 2 new relays (fuel pump & power in the
little box above the NEW coil)..I've use fuel drier, a new fuel filter...I'm
going to try removing the pump and cleaning out the tank side hose next....
any Ideas on what would short or cause stumbling on BUMPS... are really
needed..
Thank you
RR

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