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Q: Hard starting at times idles well skips and bucks when starting to drive on 1998 GMC Jimmy

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Changed plugs . Very hard to start at times , when I get it started it idles well but when I get going it skips and bucks.
How many spark pluges does your engine have? Then we have a clue as to what motor we are talking about!
Just as i thought! Adjust the carb. check point gap and choke stove. Heat riser may be stuck. Vacuum advance inop.
Centrifugal weight springs can be changed so mechanical advance override is prevalent!
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