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Drivability problem with 1984 during warmup

Fuel System

Vehicle Information: Year: 1984; Engine (size, modifications): 4.7L automatic trans, no mods; Total Mileage: 63000;

My car stumbles and loses power during warmup. Starts OK. Runs fine until temp gauage begins to move, then has very poor driveability for a few minutes until normal operating temp is reached - then it's perfect. During problem phase, it will run OK at full throttle, but part throttle it just chokes and wants to stall.Repairs to date: full tuneup (plugs, wires, filters, timing, cap, rotor). Replaced three sensors near thermostat (two temp sensors plus the thermo time switch) - no change in driveability. New fuel pump. Fuel system cleaned with three step system (Techron ??) - done by service shop. Shop now suggests fuel mixture check and adjustment. I am dubious, since it runs fine except during warmup.

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