Smell the plug next time it dies. Changed many parts. Float in the fuel delivery?

 

It wasn't a Ranger, but my dads old rhino with efi did some funny stuff one time like that among other things at the time but the injector has a screen in it and it had a piece of trash in it. Probably no help, but never hurts to look I guess

 

Yes plug looks a little rich. No float as it's EFI.

 

Had the injector out to see spray pattern. It was good. Also did a fuel pressure test on fuel pump. It was good, but for a $100 bucks I thought I would take a chance and put a new pump in from HPF. Didn't make any difference. Well cheaper then Polaris at $480. Wish I could find some info on TPS for the newer Bosch throttle body.

 

I have seen others on the site mention air leaks so spraying some carb cleaner on air intake boots and listening for increase of rpm could help resolve issue. A lean burn could stall your engine and is pronounced upon deceleration.

 

I have tried that at one time. It's a good idea so will try it again. Also I tried taken gas cap off encase it wasn't venting property.

 

Check your compression. Low compression can cause stalling at idle. Low compression doesn't necessarily mean worn parts, improperly adjusted valves can cause low compression as can a malfunctioning automatic compression release.

 

Did a pressure test on motor and it passed. Valves have clearance. I think I did a compression test in the pass but will do another. It runs good except for the quitting problem. I can also get it to quit in neutral by revving it up and quickly removing foot of gas peddle.
On another note I see you have a SVI traction control? What's that?

 

SVI Traction Control adds another option to the three drive modes that already exist.

Your Ranger came with Turf Mode basically one rear wheel drive just like that of an open differential in a car, locked rear differential, similar to a positraction rear end in a car but with no ability to slip at all when turning corners, and AWD which lock the rear axles and allows the front differential to pull after the rear wheels spin a portion of a turn.

The SVI system gives you one additional option, Turf mode in at the rear wheels (open differential) plus allowing the front differential to pull after one rear wheel spins a portion of a turn.

The amount of a turn the rear wheels must slip before the front differential begins to pull varies with year and front differential ratio.

The SVI system is available from the same people that make the Duraclutch. Some people have wired up their own home grown version rather than buy the SVI system. I chose it becasue it is a very complete, well thought out, easy to install kit. I don't need to reinvent the wheel to save a few bucks.

 

I'm going out on a limb here, but primary clutch is binding. Holding the belt and causing the engine to stop. That was my first thought.

 

Was thinking the same last night about clutching. Binding on decel.

 

pc, if you are sure the fuel pressure is correct, I would be looking hard at the IAC, especially the wire harness.......... https://otbpowersports.com/product/idle-air-control-motor-wiring-repair-harness/