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Originally Posted by gandy911
I checked all cylinders and they all had 120 Psi compression. no vacuum leaks anywhere found. you can hardly tell the engine misfires when idling but it does and when driving it isnt rough or anything it just dont have any accelleration power.
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It is very hard to tell you anything conclusive without experiencing the symptoms first hand. What you consider rough and what I consider rough may be two different things. From most of my experiences a misfire will create a rough condition, or maybe you could refer to it as an out of balance feeling. The nearest thing I can think of that would make a misfire seem like the engine was not running rough might possible be if a cylinder was misfiring constantly or if a coil pack, module, or many other possibilities were killing more than one cylinder. This would be a difficult thing to test if you have limited eperience.
There are many things that cause a general lack of power though, that have nothing to do with a misfire. Low fuel pressure, or a restricted exhaust for example can cause a general lack of effeciency for all cylinders. You may want to get a service manual that explains the methods of testing for these basic things. It is a process of narrowing down the possibilities and then zooming in on the cause. Very hard for anyone to help without some specific information. But if you are a do it your selfer grab a manual, read some procedures, and post some results. I would be glad to respond if I can help. Good Luck!