good chance the cam and crank shafts were not aligned properly or the engine just needs to be timed correctly
It will either run rough or won't start at all
The ignition timing is not set correctly or the timing chain is worn out or installed incorrectly.
If the engine runs rough after a timing belt change, the belt may not have been tightened properly. It may also mean that the wrong timing belt was installed. Either way, it needs to be taken back to the mechanic.
The ignition timing on Contour engines is controlled by the computer, and is not adjustable. However, if you're talking about the 4-cylinder 2.0 liter, it uses a timing belt for the cams, and if it is worn and slips a tooth, it would cause some real problems. (The 2.5 liter V6 isn't subject to this, as it uses a timing chain for the cams.)
If you have a worn timing chain that hasnt been changed before, that can cause the timing to jump and cause your car to run very rough or not run at all
hi sounds like it could be a vacumn leak or double check cam timing. jerry
This vehicle needs a tune up, new spark plugs, maybe new spark plug wires. It may be out of timing. I would also add the plug wires may be installed incorrectly.
Timing belt, vvt drum worn out, thin oil in engine, burnt valve, bent valve if timing belt jumped, injectors cloged up, weak fuel pump, intake leak pcv valve worn out vac hose leakage , worn rings
Low fuel pressure, clogged air filter or off timing can all cause rough running. There could be sensor issues or more serious engine internal problems.
You do not have the correct timing set for that car.
Scan for codes, some parts store do it free.
One of the reasons why a Tahoe motor would skip and pop could be due to a loose timing chain. Some of the other causes of a loose timing chain are rough idle, sluggish performance, and the sudden change in the engine performance.