Hi I have a 2004 volvo xc90 2.9l t60. After replacing the fuel pump this summer everything worked perfect with exception to a few seconds crank to start. Now it is shaking oddly at idle and sometimes when going uphill. I replaced the top engine torque mount, as it was Gone. Still no luck. Changed spark plugs... Noticed timing belt is cracked up. Should I check timing? Feels like really week compression. Any common issue with this 2.9l volvo? Thanks,