Rough idle when cold. Intake air leak? Acts too lean. on 1995 Chevrolet 1500 Pickup

290,000 miles uses some oil, puff at start. Runs great warm,has new gas tank and f pump, carb was reset about 100,000 ago due to some air leak. Has new f filter.

Not sure how to find air leak? Or test fuel pressure? Of replace in carb injector?

Asked by for the 1995 Chevrolet 1500 Pickup
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