I have replaced plugs, wires, airfilter, pcv valve and assembly. New distributor and ignition module. It only happens when I am climbing hills. Normal driving is fine.

When was the fuel filter replaced? How many miles is on it...

. Check the ignition timing:

https://www.askmehelpdesk.com/cars-t...tml#post219963

It may be retarded too much. Loosen the three distributor mounting bolts and rotate the housing slightly counter-clockwise.

. Replace the fuel filter, if it has not been replaced in the last 60,000 miles or 48 months.

Is the coil new?