Originally Posted by
BLK94EGCOUPE
I wouldnt have used the B7 IM but you can have quit a few factors contributing to your problem broken IM gasket or a leak between the head and IM especially if you didnt corectly torque it down also your pcv valve could be bad or not even hooked up to the resonator can on the back of the block hope this gives you some ideas what to look for.
+1 on the intake manifold. i dropped a z6 in my boys crx. had to replace the tb gasket cause it was pulled off when he got it. used the worng gasket and it surged like crazy when i warmed up. blocking a passage and didnt seal properly. you can use propane to try to trace your intake/ vacumm leaks