I have a 1990 mazda b3200 4cyl and did water pump. And put timing belt on proper marks but still seems out of time. Will run but not idle

Check for vacuum leaks around the intake
and all vacuum hoses the idal control. Mn

Check if all the vacuum hoses are properly installed.

check the fuel pump pressure ,should be 55lbs ,if ok then the idle control motor solonoid ,if it runs for 5 mins ok then its not the timing

1. Disconnect the battery and chock the wheels so that the car cannot roll.
2. Remove all obstructions to the timing belt cover: This can take a while, as there are usually quite a few things in the way. Here's a list of a few common pieces you'll have to remove:
   • Remove the air intake assembly.
   • Loosen the pulley that powers the water pump, if necessary. Some cars require your to remove other equipment such as the power steering pump. If so, remove the belt from the pulley, and unbolt the pump. Move it back out of the way.
   • Remove any other accessories that interfere with access to the timing belt.
3. Use a large wrench on the crankshaft pulley to align the mark on the crankshaft pulley with the 0 on the timing scale molded into the engine block.
4. Remove the timing belt cover bolts and pull the cover off.
5. Check the timing belt tensioner bearings. Replace them if they are loose or noisy.
6. Check the camshaft and crankshaft seals. If they leak, it could cause premature failure of the new timing belt. Replace them if necessary.
7. Make sure that all timing marks are properly aligned, then loosen the timing belt tensioner and remove the timing belt. Do not allow either the camshaft or crankshaft to move while the belt is off.
8. Put the new belt in place. Adjust the tension, if necessary. Make sure that it sits well over the teeth of the timing sprockets. Don't over-tighten.
9. Apply a new gasket to the timing belt cover and replace it.
10. Reinstall all of the accessory pumps that you took off earlier, including the water pump. Many mechanics recommend replacing the water pump while you have it off. It's up to you.
11. Check that all timing marks are still properly aligned.
12. Reinstall the air intake assembly.
13. Reconnect the battery.
14. Start the engine and listen carefully to how it runs. You shouldn't hear any loud knocks if the timing is still correct.

Hopefully this timing belt replacement guide has been helpful. If you allowed the timing to become misaligned while you changed the belt, you have a serious problem on your hands. Either correct the error, or consult a mechanic or car repair shop. Do not operate a vehicle with incorrect timing, as serious internal engine damage could occur.

when you installed the timing belt back on the gears you have gotten one or more teeth out of time on the cam gears this is why it runs good on the road but badly when idling.you will have to remove the timing cover and reset the engine on #1 compression and check all the timing marks and make sure they are in the proper position.re-adjust and recheck all marks are in the proper position after rotating the motor twice.

You have to really put some pressure on the timing belt tensioner,then tighten it down, make sure that belt is tight. then check your marks. You got them close because it runs, it's because on some models the belt has to be tight to get the marks to line up perfectly.

i dont have a more detailed picture of setting the timing marks for the belt so i hope this helps

does the water pump run off the timing belt or auxillary (fan) belt? maybe timing belt has slipped some teeth?

The Only way is to Go through the Whole Procedure of Timing Belt Replacment Sorry to be the bearer of this Bad News but a tooth off is going to cause what you discribe.