Engine either dies or revs high at stops-86 nissan pulsar

Intermittent failures are difficult to diagnose. Try removing the radio and remove the plugs from the back. Look in the connectors for corrosion. Then spray with electrical contact cleaner and replace them making sure they seat well.

There are other ideas here

https://www.google.com/search?q=2004+Nissan+Pulsar+N15+Rear+speakers+have+stopped+working

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Carburetor idle circuit is not working - carb needs to be cleaned and reset to restore normal operation.

check fuel pump pressure- fuel filter --air filter --egr valve if carboned up clean or replace and cat converter feel the exhaust if feels restricted may be clogging up

The TPS can play funny tricks like this. Also sounds like a throtle linkage problem as well. Do u mean disengaged rather than engaged?

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Sounds like computer issues from the cables being on wrong

try doing the mixture screw as well

Check your Ignition timing before anything
check your plugs see what color they are
red or orange means carb is to lean , black
or oil means to rich then you can go from there
and set mixture screws on carb , let me no how you make out .

I have a similar problem which seems to stop ,if after 20 mins of driving or warmed up engine if you stop for 10 mins the revs die to a more normal 1500 revs! it is a spanish car now living in theUK I think the problem is choke related.

hey-I have has this before different car but same - idle control valve is failing - computer at shop will pick this up on diagnostic