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fuel pump diagnosis: stalling when warm
I'm having some weird issues with my 98 2.5 and think it might be the fuel pump. Before I drop a few hundred and get all stinky swapping the pump - is there any way to test the pump?
I was driving today - normal commuting and had no issues. Parked, returned, drove, everything fine. Then later in the day I hit some nice back roads, high RPM, high load stuff. When I pulled up to a stop sign the idle began bouncing up and down, almost stalling. Not sputtering or running rough, just up and down. At the next stop sign, the idle would dip and it would stall. It would immediately restart with the key, and if I feathered the throttle it would be fine. If I put it in neutral and left the throttle alone it died.
I read some accounts of bad pumps causing stalling when hot. It's odd that at high RPM high throttle opening, even in bend, I had no hesitation or stumbling but at rest, idle it would die. If the pump is going, wouldn't it have trouble with high-demand situations?
I pulled the relay and popped the cover off. No broken connections apparent, looks fine. The car sat maybe 10min and is behaving better. Idle a little wavy after throttle blips in neutral but no stalling.
Ideas?
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