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Q:

Idling ok, it seems to starve fuel; then pops or just putters. on 1993 Subaru Justy

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The puttering or popping or seemed starving for fuel happens when a load is puton engine. Ease up on pedal, then gains power.
(1) Answer
Peter,

You still have a Justy on the road? Wow, good for you! They were definitely economy from the start.

OK - so - I would suspect an air intake leak, engine vacuum leak, or lack of fuel pressure. Last, you could have an exhaust restriction, such as with the catalytic converter.

Have a diagnosis performed to get a good answer.

Good luck,
-Dave