Replace the HT leads to the spark plugs.
A timing chain, that needs to be replaced, can cause your engine to run rough and lose power. A broken timing chain can cause significant engine damage.
You do not have the correct timing set for that car.
what does trouble code p0420 means on 2000 daewoo laganza
yes mine had a really rough idle and it turns out the motor mount needed replacing
If the timing chain has jumped time, the vehicle will run rough or not at all. You will need to check the time with a timing light to see if it is off.
check vacum hoses timing and tune up
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.
replace timing chain
Not unless the bearing in that pulley is noisy or rough when you spin it.
Your timing is off. Buy a timing light.
If the timing is off by a few degrees the engine can start but will run rough. More than a few (depending on the engine) it will not start.
Motor mounts are bad
Stalling rough. Like stalling while on a hill. That made mine skip.
It is a common suspect in contributing to rough idle. See "Related Questions" below for more about the EGR valve, from testing to replacing.
Did you manually clear the codes ?
Could be a burned valve (do a compression test of all cylinders) Could be a timing problem (check the timing)
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
Normally it will become noisy and your engine may run rough and be hard to start.
Up to approx 2001 most do from then mostly chain for petrols as a rough guide
It will either run rough or won't start at all
A Grand Prix can idle rough for many reasons. The timing may be off, the fuel filter may be clogged, or it may need a tune up.
There's no way to set timing. Just align marks on camshaft and crankshaft during belt installation. There may be another problem if your car is still running rough.
If timing is bad on a 1990 Acura Integra they car will either run incredibly rough out not at all. To fix the timing be sure to correctly align the distributor to the right factory specified degree.