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If you have found a leak in the FPR, then replace it with a new one or at least a good used one. If the problem persists but you find no fault with hoses, or air or vacuum leaks, then read 700/900 FAQ particularly regarding engine tune and performace. Systematically test sensors, particularly AMM, connections and grounds at ECU. Before I knew Brickboard, Ringlee and Don Foster, a Volvo mechanic changed the AMM in my 760T three or four times. I paid for two or three of those at a couple of hundred a pop. Still, the car would do as yours, often under acceleration but otherwise unpredictably. I read (studied) 700/900 FAQ and armed with a Fluke and specifications sheets I tested everything in sight and repalced everything out of specifications. The car improved dramatically, but the car still did like yours now and again. Then, I found resistance out of specifications in one of the AMM grounds (over 4 ohms rather than under 1 0hm) at AMM and ECU. Took ECU apart, resoldered and got resistance at both grounds (and other connections) to be 0 ohm. The problem appears to be solved and the car runs better than ever. Knock on wood, steel or whatever.
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