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Re: 98 Sunfire P440 Code
I would 1st examine all hoses and vent lines, by squeezing them while engine running and see if same symptoms ( engine wants to stall or slow down )
Also, if you had a old garden hose, you can cut off and chunk and hold one end to ear and near vacumm lines to hear if leaks.
Since you also mention gas issue, may not be related but have you had your fuel filter looked at ? Maybe clogged. But i also beleive there is a evop line near tank as well which maybe clogged.
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