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I can only speak for mine, but it never had a problem at higher RPMs. Only died at idle. I don't know the reason for sure. Possibly at different throttle positions, the injector pulses were longer, or faster. (That's a guess). I replaced my own once - it had a rear tank (~35 gallons), and I replaced one for a friend - it had the side-mounted tank. That may or may not be practical for you. You'll want to wait until the tank is empty unless you have a pump or something to empty it. You basically loosen the straps that hold it up and lower the thing. You can put a jack under it with a scrap of plywood to help lower it, or whatever you come up with. It's not particularly hard, just a dirty job. There's a little retaining ring that you spin off, then pull the pump out of the tank. Brush/wipe off the dirt off the top of the area first so a lot of crud doesn't fall into the tank. There may be clearance on your vehicle to access it without removing the tank, but not so on the ones I was involved with. If I recall, the pump was in the $50 range, and it took a couple of hours to install. I've done the thing where you replace the sensors, computer modules, etc. in the likelihood order the service manual says, but on any vehicle I've messed with, it's never been the sensor itself, but rather some other factor not considered in the diagnostic flowchart, like a vacuum leak, a bad ground, etc. (Or a low-pressure pump ;-) ) Of course, with my luck, it's probably the MAP sensor ;). The only problem on replacing electrical items, if you find it wasn't the problem, the parts store generally will not let you return an electrical part once installed. Good luck with it. I hope this helps. If you were nearby, I'd help you replace the dang thing, out of curiosity.
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