Q: MAF need replacing

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Have an ST170. Upon slowing down, idle goes high and then drops, have done brakecleen test on gaskets & seals and also MAF cleaned with MAF cleaner as was quite dirty. Idle is now only rising to 1500rpm instead of 2000. Sometimes it still holds high idle, other times it drops normally. Could the MAF need replacing?
My car has a manual transmission.

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