I have a 2000 4.0 and i just changed the head gasket now there's no heat and a viberation at idle but only until i put in gear and drive it, after that it goes away when its back in park or nutural. Its got me pretty stumped so any help will be appreciated, thanks.
Yep, bleed the air out as far as the heat goes. The vibration however; only a few suggestions. Exhaust leak can cause a vibration but will still have power. If antifreeze got into a cylinder during the job it may have fouled a plug when you started it. This would cause major vibration that would lessen as RPM's go up. Serpentine belt centered on all pulleys? Good luck.
*** 1956 CJ-5, milled head,elec fan,power steering,4-whl discs,rubber mounted cage,all drivetrain and engine incl distributor vented into firewall,Saturn overdrive,Lockrites,Rezeppa joints,2 1/2" springs arched add'l 1 1/2", homemade expanding shackles,reinforced frame,glass tub, stainless tank, 31X15.5 Terras on 15x10 and 15X12 rims-trail, 31X10.5 A/T's on 15X10 alum rims-street,Amsoil.