Hi guys I have a 308 from 79. The car feels like it only have 4 cylinders. Cam belts are changed due to the car has been sittning in a garage for a long time. Timing marks on the cams are spot on to the TDC mark on flywheel and timing is 10* btdc on low idle. ( US spec car without cats and air pump) When I connect a vacuum dial and have the car on idle the needle fluctuates between 0 an 20 on all intakes. Feels like the timing of the cams are wrong, but they line up perfect when I check them. Any ideas ?