chipped ecu

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Wilshire

Big WIll
i recently bought a chipped ecu and when i put it in there is a very loud hissing sound. It really sounds like a vacume leak. and it also has an irregular idle, (jumps and drops). this continues for the first ten minutes the car runs then stops with a subtle clicking noise. Then everything is fine and normal.
when i put my stock ecu in there was no problem at all and everything acted normally. ive re-installed and taken it out a few times and the results are the same.

What could the noise be. I really have no clue due to it only acts up with the new ecu and not the stock one.

any info would help
 
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