do you have fire at the plug? if not the cap has coil in it and needs replaced
I dont think you have to worry about that. 1999 has timing chain I dont think you have to worry about that. 1999 has timing chain I dont think you have to worry about that. 1999 has timing chain it does have a timing chain but if it has really high mileage its better to check and replace if it needs it because if it skips timing it could seriously damage the motor
Check for excessive slack in the timing chain.
Check Coloradofans.com or 355nation.net. Both are leading Chevy Colorado message forums.
If your vehicle is at least 60,000 miles it is recommended you replace the timing chain. If your timing chain broke, your engine would NOT run because the timing chain is what rotates your engines camshafts to open and close the valves. Also, you would have some serious engine damage if you were driving and your engine suddenly just quit and it happened to be your timing chain. There really is no way to "check" a timing chain as it's hidden behind the belt area of the engine (if I'm not mistaken). If you're going to go through the labor of "checking" a timing chain, you might as well replace it, as the average timing chain job costs about $220, $200 of that being the labor.
Check water pump and pump gasket.
The roll pin in the distributor drive gear may be broken. Remove distributor and check. Camshaft broken, But not very common in stock engines. Timing chain broken. Not common either. Cam gear on the timing gear may be striped off/teeth gone. Check timing chain.
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.
It might not be the timing chain, check if the exhaust muffler has not come adrift.
NO there is NOT one definitive answer. It depends on the year and engine size. It could have a chain or a belt. Check the timing cover, if its plastic its belt, if its cast metal its chain.
Easiest way is to pull the valve cover and turn the motor over by bolt on crankshaft and check to see if the valves are moving
Check for vaccuum leak. Check ignition timing Check timing chain (may have jumped) Check for restricted exhaust Transmission? Clutch slipping? Plugged air filter? Plugged fuel filter?
check timing. timing advance. or slack in timing chain/belt