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Check the throttle position switch. It is what tells the brain that the throttle is at idle, or WOT, so maybe the top suspect. Make sure the throttle linkage is allowing the full motion as well.
A vacuum line runs from the manifold vacuum either from the plenum or the throttle body back through the firewall to the ignition computer. It needs to go to the correct spots and have no leaks. Check the timing with a timing light as a start.
Is the car in the US, if so it has some kind of "box" added on to federalize the smog, and as they age and go through the hands of many mechanics what they do can become unpredictable.
Sooner or later you need to go through everything on the top of the motor, replace all the vacuum and breather lines, clean the throttle, and check all of the sensors and related wiring.
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US 83 zinc metallic 5 spd, aka the nice car.
Euro 85 black, 5 spd, the fast rough track car maybe car. SOLD
Euro 84 red, AT, only car in garage in years, my parts car, soon to go last 7 years.
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