bad idle 2.3 T5

[steveo82]

hi all, been a while since i posted but now have a hilariously bad tickover/over run most noticably when coming off the throttle and declutching like 2nd to 1st gear changes

makes me wonder how much longer this car will last but if i can sort this problem without to much hassle it should be ok for a wee while longer!!

its had ETM replaced by cops only done about 50k so hope it aint that, also plugs and one coil have been replaced but it doesn't misfire when revs are up just when giving it very light throttle, strange????

code read with a basic OBD2 reader and nowt in memory but MAF reading showed 3.50 G/S which ive been told is well low, should be between 12-20 from idle to full welly??

any help appreciated as always

[t5 stealth]

check the idle valve.
might have split pipe or hose or just a clean out