While driving the engine begins surging, but it does not stall?

1994 DODGE COLT
131,475 MILES • 1.5L • 4 CYL • 2WD • AUTOMATIC
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KENNY HICKS
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Starts right up every time. Drive around the block, engine begins surging. Doesn't stall, or shut off. Still drives okay, I'm lost, can you help?
Oct 26, 2023 at 2:09 AM
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STRAILER
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This happens when there is a vacuum leak or the EGR valve is opening when it should know, I would disconnect the EGR vacuum line to see if that fixes it and then use this guide when the engine is cold to try to find the vacuum leak:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

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Oct 26, 2023 at 1:26 PM