89 S10 4.3 misfire

[SoCalSlaughter]

Hello all, recently my friend bought a 89 S10 with the 4.3 and 700r4 for $800. "Running" and driving. It has a decent misfire at idle, engine shakes abit. It has close to 180K miles. Engine starts fine, no ticking, no smoke out of the exhaust. Oil looks fine, cooling system is fine. No engine light. So far we have changed the O2, fuel filter, wires and plugs, coolant temp sensor, changed the dizzy (gear was worn and shaft had some play), replaced EGR valve, cap and rotor. Triple checked firing order. Base timing with with timing connector unplugged set at 0. When accelerating from a stop the mis is more present. Any ideas or direction would be appreciated! Thanks