So is a L4?
Try Pull spark plugs.
If 4 plug shows "rust" then could be dead intake manifold gasket.
#4 under vacuum and coolant is 0-16 psi... Is easy for #4 sucks coolant from bad/loose gasket.
Intake Man Gasket w/ bad install can easily die.
This gasket isn't used w/ any sealer. Many people use RTV and is a big no.
low torque is big problem.
over torque can break intake.
Fixing if true?
use FelPro gasket and torque to spec. (25 ft/lb)
Torque is for clean and dry hardware but be careful because 1
goes thru head into oil drain hole for valves. torque to spec that bolt can break intake.
(1 hole next to dog bone bracket for 87+ versions. Not sure if applies to older versions. Very likely is same.)
------------------Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
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[This message has been edited by theogre (edited 11-21-2014).]