What do you mean by a Hollow plug? Is it a hole? If it is just a hole it's suppose to be plugged up otherwise you will have a major vacuum leak. If it's just a hole you'll need to plug it, this is the access to the CO set screw inside the metering unit. If you lost the plug to it, I have heard of a few people using golf "T's" in it's place. Steve --- In dmcnews@xxxx, "J Rowe" <rowejj@xxxx> wrote: > On a side note, there is also what looks to be a hollow plug between the air metering unit > and fuel distributor. Is it supposed to be like that or is there supposed to be a screw or some-