Vibration under load
So I have an 06 trailblazer with the 4.2 and besides it's usual little issues I got a couple I want to run past you guys. The first one is easy I believe my fan clutch is sticking. Here and there the fan runs at full tilt until you stop and idle for a second then it seems to run normally. The motor isn't getting hot and usually it's on the first drive of the day. Wanted to run this one past you guys and see if you agree and if there were any easy fixes. The new and strange problem as that in gear while not moving the engine has a deep low vibration. It doesn't sound unhealthy just like it's working harder than it should be or idling to low. It got new plugs, fuel pump, actually all kinds of stuff about two years ago so I don't think it's a simple tune up issue. If I put it in nuetral or park it idles up and it's fine. It's got about 165000 on it but that is not nearly long enough for an inline motor to be clapped out. When I replaced the intake gasket last year (vacuum leak) it did have some gunk but I don't think it was an abnormal amount. Still runs good, no loss of power, once it's warmed up and driven for an hour or so it doesn't seem to do it as much but I can still feel it.