When I start my car cold, the engine seems to shake/vibrate a little for a minute
and then smooths out. Could this be a fuel pump issue, a spark plug issue,
engine mount issue or what?
Could be a bad spark plug, but I’m afraid that it sounds more like an early warning of a blown head gasket. An early sign is a slight misfire upon initial start up and will only last a few seconds then smooths out.
Could be the the front two torque arms look at the bushings inside the arms of the rubber is cracked or missing there is the problem also if the idle is irratic could have a possible vaccine leak. While the engine is running spray starting fluid or brake kleen around vaccine hoses and intake if idle goes up and down while spraying you have a vaccine leak. Would not hurt to put plug and wires just make sure you use OEM EQUIPMENT OR SOMETHING EQUAL Hope this helps
I am planning on doing a tune up soon. It can't be a head gasket because all 6 cylinders tested at 140 psi a few weeks ago. I will have an inspection done when I take it in again.
I just did a tune-up with new pugs and wires and it seems to have eliminated the issue. I want to do a leak down test and a smoke test to see if there are any more problems.