Hi there, I have had this issue for years now, I had the injectors cleaned, new temp sensor, cleaned the AAC valve and really didn't see that much of difference. One thing I did change which helped a lot was one of the Fuses that goes to the ECU, this made the most noticeable difference but didn't cure the issue. Does anyone have pics of what the Cold Air Reg looks like on a 33? Just want to have a look because it might be worth a crack.