i have a 2004 f250 6.0 and it has egr delete, arp headstuds, straight pipe and sct tune. when the motor warms up it pukes coolant from the degas bottle around the cap.not alot but enough to be noticeable. replaced the cap with one from auto zone. kinda looks cheap compared to the factory one but it stopped it for a day. then it started doing it again. afraid its head gaskets even though i had them done 24,000 miles ago and studded it. hoping its not that. maybe just a cheap cap? any suggestions would be appriciated!! getting frustrated and considering getting rid of it!!