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1987 924S Rough running

Fuel System

Vehicle Information: Model(924/944/968): 924S; Year: 1987; Body Type: Coupe; Total Mileage: 165,000;

After normal operation had started car and as pulling away car "bucked twice", questioned if start of something. Next day drove car around block to test without any problems, then drove about 4 miles and car kept running but with no power, limped car to safe area. Kept car running by rapidly pressing gas pedal ("feathering if correct term ?" and if put gas pedal to floor tach would come around but only for a moment, then would go back to feathering. Could keep car running (no backfiring or roughness noted, just no power, turned car off a couple of times and would start ok) and was able to move, but not road safe. Had car towed back home. Seemed car ran ok when backed into spot off tow truck. Have replaced fuel relay once and have replaced fuel filter at regular intervals. Original fuel pump. Was thinking should do a fuel pump test to see if correct amount of fuel being delivered ? Was wondering if begining of intermittent fuel pump trouble ? Have you seen original fuel pumps last 22 plus years or more ? Just starting investigation as to problem and appreciate any insight you might have as to where to start or other things/items to look at or consider.

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