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Im going to have to agree on maf scaling. If your on ecutek or maybe oft has speed density but when the engine is inside the maf range it could use the maf still. Tuning for the turbo would mainly focus on the speed density tables in order to make it safe but maybe the maf got skipped. If you want to check record a log and see if your LTFT (Long term fuel trim) + STFT(Short term fuel trim) are greater than a 5% value or less than a -5% value. If that is the case then your maf scaling is off.
If your on oft it might be all speed density and the stumble you feel might be temp. based. Speed density doesnt do well with variations in air density such as altitude or temp. If you say it happens after stopping at a gas station it might be heat soaking temp on your intake causing the issue. If thats the case than ECUTEK is probably the solution your looking for.
If not then im out of ideas.
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