unstable idlling-stalling im going nuts

[leadfoot6]

i'm no where versed as you guys are about engine stuff.. but what i observed when i was testing the TPS using a multimeter at ohm setting.. is it's off, then it's on and then provides increasing resistance (maybe decreasing not sure if i recall correctly) but either way it would be something like
off-on-1 2 3 4 5 6 7 8 9 as the sensor gets twisted. so it's basically acting like a volume potentiometer. i tend to think, since off means no pressure on the throttle so it should be set as near as possible to that position. the instant you step on the accelerator, cable gets pulled and throttle is now on and increasingly open in relation to the tps reading.. so if you start at the right spot.. it should continue with the right spot ( wrong assumption?)
adjusting this location merely by the feel, might be misleading.. well maybe not so much for experienced people i dunno...
if the TPS had a design such as not just off- on.. but off - idle - on - 1 2 3 4 and had there been a sweet spot between the on and off that is immeasurable.. then i'd see it's complexity.. but from my experience multimeter served me just fine. (3rd gen TW)
after i replaced the sensor idling etc had been all fine since the MAF began acting up.. from what i see it had been acting up all along just gave a long break from being a pita for some reason.

Just in case, check that your throttle cable is adjusted correctly first i.e. no slack.

Not over stretched, not too loose, but just like Goldilocks.....JUST RIGHT.

It took me a quite a few months after I purchased my TL almost 5 years ago to realise that the throttle cable was loose.

And after I got it back from Mitsfix after the 380/6g75 swap it was loose again.....but even more so.

This is somewhat understandable, as the modified 380 upper manifold has the throttle cable bracket TIG welded on and is not a factory original fitting and the throttle cable adjustment may have been overlooked due to the time pressure that Brendan was working under.

It pays to check this very basic item.

[GRH]

Just in case, check that your throttle cable is adjusted correctly first i.e. no slack.

Not over stretched, not too loose, but just like Goldilocks.....JUST RIGHT.

It took me a quite a few months after I purchased my TL almost 5 years ago to realise that the throttle cable was loose.

And after I got it back from Mitsfix after the 380/6g75 swap it was loose again.....but even more so.

This is somewhat understandable, as the modified 380 upper manifold has the throttle cable bracket TIG welded on and is not a factory original fitting and the throttle cable adjustment may have been overlooked due to the time pressure that Brendan was working under.

It pays to check this very basic item.

no expert but i'm pretty sure it's just right.. the feeling is there, tightness and the response from the engine the instant i step on the pedal

[leadfoot6]

no expert but i'm pretty sure it's just right.. the feeling is there, tightness and the response from the engine the instant i step on the pedal

That sounds OK.

But just to be sure.....is there any slack in the cable when you raise it up by hand before the throttle pulley moves?

I did not seem to find anything amiss when operating the throttle from the cabin, but I only noticed the problem when I opened the bonnet and made a close inspection of the actual throttle body.....where I saw the slackness of the cable.

This youtube video:

https://www.youtube.com/watch?v=LAC_LX4ioOU

will give you a good understanding of what is involved.

Note at the start that the throttle cable is very loose.