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So you know, I don't think I've replaced more than five or six tp sensors, ever. I wouldn't rush out and purchase one of those. What about the cap and rotor? When were they done? A slow rpm equals a slower turning rotor. Do you run the air? Does she run the air? Could that be the difference between the two of you driving? I saw that you serviced the throttle, but have you recently cleaned the idle air motor? Ask your wife if she can correlate the stall with perhaps the front fan coming on. If the belts are a bit loose, or maybe a crank pulley is a little sad, and the AC is running, and the alternator charge is just barely where it needs to be, and then that front fan comes on,the idle will dip down to nada, and then the car stalls.
You also have a suppression relay...inner fender well, passenger side. I have had the fuel pressure regulator affect a very low idle on a Regina, and cause the very same...spit, sputter, pause on acceleration from a dead stop. I've replaced it with the higher pressure, just for Regina, regulator, that Volvo developed for those cars that just wouldn't idle above 500 with the AC on.
Chris
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