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The popping noise sounds like it may be miss firing or running very lean.
I have seen on a another post that you might want to ckeck the ignition power stage module. It is behind the battery on the inside fender panel. You might just plug loose the connector and check it for corrosion. Just exercising connectors help scrub the pins cleaner.
Same for the injector clips, especially for the rear ones.
Do you have a check engine light on?
Even if you don't, you may want to access the codes from both 2 and 6 pin positions of the on board diagnostic block by the brake booster. I think #6 may be a component testing pin position. I vague on that and also if your 1990 has the whole thing. You see I have a '91.
Lean running means you may want to recheck your vacuum hoses, cabin components for a more progressed intake manifold leak.
Check the bellows tube behind the air mass meter to the throttle for holes with light from the inside.
Sometimes a tiny hole can get worn into the volutes and cause idle issues. I have plugged them with liquid electrical tape. A little dab will do ya! I use it a little at a time, from both sides and build it up.
Since it runs fine, then jumps back into the bad mode, something is loose/leaking or not able to keep a good connection.
Intermittents can be a nice puzzle. It's usual caused by a slow deterioration.
It's maintenance time!
Phil
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