ok just so we're clear, i'm a rodeo guy from the "other side." my buddy's 89 cherokee just started running rough only when cold. i put in new plugs and rotor and cap but no joy. #1 plug was covered in some hardened deposit like i've never seen in 30 years of working on cars. <img src="/forums/images/graemlins/confused.gif" alt="" /> now it's running bad all the time and i believe he's sucking antifreeze. my ? is, does the intake manifold have passages for coolant? is there a "usual suspect" for this type of behavior. i've never worked on a jeep, though i am impressed with how they hold up. i was actually looking for a cherokee when i bought the rodeo, so i really am a nice guy.....any thoughts? direction to run? tia <img src="/forums/images/graemlins/patriot.gif" alt="" />