Engine hesitation, poor acceleration, excessive fuel consumption and Engine stalling could be caused by inaccurate engine timing. This purpose of inspection is to check engine timing.
Set the TDC mark on the crankshaft pulley with the "T" pointer.
Set the timing marks on the camshaft sprockets(Left,Right) with the pointers of the cylinder head covers(Left,Right).
Are TDC marks on the Pointers?
YES
Engine Timing is OK.
NO
Repair or Replace the timing belt.