98 Frontier 2.4 5 speed driveability problems

[kansas240]

Truck is running fine, except for when I try to accelerate quickly, it stumbles in all gears.If I short shift, I can get up to 80mph with no trouble, idles smooth.No codes are being thrown and the MAS seems to be fine ( I plug the little hole and the truck dies)I can run the a/c and idle fine. It started doing this while I was on a long trip, then the trans fried. It even melted 5th gear to the shaft and killed the speed sensor! somehow it sucked a gallon of water in the day after I got new tires and an alignment.

I replaced the trans, and it was working fine last night. Now it has come back again.

What would cause it to die? is there a secondary timing profile? it revs freely in neutral, only under load does it die, and always after part throttle. fine around town.

[seang]

Throttle position sensor?

PS, IDK if theres a way to test the TPS, but don't just go and immediately buy a bunch of new sensors because you can easily spend a couple hundred dollars and not even find the right one. If nobody else on here has any input on this, you could try http://www.nissanoffroad.net , you should check all the old posts as there are many.

[Desert Rat]

Yeah, I'm thinking TPS too. When it malfunctioned on my Xterra I had this exact problem. Would work good up to about 1/2 throttle. Any more than that and it was like I was flushing the toilet.

[RT22]

Get junkyard one to try just hope it is good LOL but cheaper than new one to troubleshoot.