Vehicle is doing 190000km problem was jerking rough idle and noisy.at first checked the coil pack just replaced two.put new plugs still no change.got a mechanic to open the head found that the tappet on the valve the clip was broken and it dislodge off the valve.sent it to the engineers did the seals and replaced 4 new valves.set the timing using the power tool and checked the chain all was fine.turned the engine then started the car.it started at first but once pressed accelerator it switches off.open to test the throttle body by turning the ignition and pressing the accelarator to the ground the throttle does not open.tested the fuel line there was no air coming through.can someone assist me on what next to do.I have an appointment with someone to do a diagnostic test for me later today.does it sound like a major problem or not?please advise tx