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speed is not an issue or shipper. Im making a harness for my custom ECU. (non Suzuki)
Your issue:
sounds like your car is an 8valve and all 8 valvers RACE when they have an intake Air leak.
a vacuum leak as we call it.
on an 8V, the engine ECU will detect the leak (map sensor) and match it with a perfect mixture of gas. so it races and makes tons of power.
but it is busted ,non the less.
PossibleS:
hose cracked , split or dropped of one for the vacuum lines.
Vacuum booster diaphragm cracked or its hose , brake unit. (uncommon)
EGR valve loose or gasket cracked.
IAC loose.
IAC stuck full open (common)
Anything else that could leak air into the main induction plenum (below T
you gave very good problem discription: that 0 rpm is a bell ringer, says IAC is stuck.
cold 1200.
then when hot ,800 (then ECU controls IAC valve by modulating it for perfect idle)
should never drop below 800 unless IAC just stuck or the wires fell off of it.
I believe wires drop cause increase. so no that.
Clean IAC.
lets hope it is not ecu , crazy
do my ECU test here: ( its just a basic , test for "is it alive")
ECU