I have miss fire on cylinder#5 and random misfire I chang plugs wires ign. coil and still misfire 08 dodge grand caravan

If by timing you mean that you aren't sure that you have the belt on the cam/crank assemblies properly, now is a bad time to mention it. This is an interference engine. Proper alignment of the crank/cam with the timing belt is critical and must be exact or serious internal engine damage will result. Even turning the engine too far without the belt properly aligned can damage pistons and valves. At this point if you didn't get it right, the damage is probably already done. For a quick check, disable the fuel pump, pull the spark plugs and perform a compression check. If it doesn't pass, take it all apart and assess the damage and repair as necessary.

Personally, I use a paint stick to mark the original belt location. Then I take the belt off and transfer the marks to the new belt. Be sure to put a new water pump in and also a new spring on the tensioner.

If you already took the beloff, then there are actually timing marks. I forget where the mark on the crank is, but it should be slightly obvious. The mark on the gear lines up with a mark on the oil pump. The camshaft gears each have 2 marks. On the front you use the one with the 'e' and the 'I' on the back. The notches have to point at eachother parallel to the cylinder head.



Good luck...

If you are talking about one you purchased return it and look at another one. If you are looking for one on the engine they may have used liquid gasket.

What type of car.

where? which product? model? brand?