Celica dies out

A few weeks ago, my 94 celica wouldnt start right after i drove it until it cooled down, so i brought it to my shop and replaced my fuel pump, coil & ignitor and had it tuned up. Car always starts now, but after about 15 minutes of driving it, gets hot and wants to die out unless above 2k rpms. putters below 1k rpms I really don't know what to do next, can someone help me figure this out
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I'm going to close this topic and we can continue to discuss over there.