Originally Posted by ant7 (Post 8886473)

If you didn't move the adjusters much, [fraction of a turn]then i would also be inclined to think spark plug wires broken, if the tappets are too tight, then the valves will not close, therefore, that/those cylinders will not fire up, or they will miss-fire, i would first check the spark plug wires, make sure the metal connectors in the ends havent come out, then, as others have said, try and i identify which cylinders are not firing, you can check this by either pulling the plug leads off, [use a very well insulated pliers, or grips, and rubber gloves to be safe]one by one, and hearing if the engine rpm changes, or, check the heat of each exhaust pipe coming directly out of each cylinder, Warning! if the tappets have been adjusted way too tight, then there is a possibility of valve to piston contact, but you say you didn't adjust them by much, so i would suspect that to not be the case.
Hope this helps.
Anthony.

Originally Posted by mreid (Post 8886539)

People rarely get the valves too tight unless they use the wrong feeler gauge. Typically they are too loose if anything given the locknut pulls the foot away from the valve stem or they don't have the rocker on the cam base circle.

Your problem is not valve adjustment. You either have the plug wires installed incorrectly or screwed up the ignition in some way. Did you change the plugs?

Originally Posted by avsarinana (Post 8886504)

What is adjusting to tight, I was able to slide the feeler gauge back and forth on each valve... Can you be to tight and still not be able to slide the feeler gauge back and forth..

Thanks

Originally Posted by wayne robson (Post 8887314)

A few items that may help you,
You say you changed plugs,the correct procedure is to check your valves
first before removing plugs,here is why if you removed the plugs first,because it
makes it easy to turn the engine over while checking valve clearance,but what can happen is while doing this carbon pieces can fall from the plugs or cylinder chamber and into the valves, so when checking clearance not getting correct spec. new plugs should be changed after.Also another source while threading your plugs in using the factory socket
you always have to be careful not to crack the side enamel on any plugs, as that will also
give you a bad miss.
go to www.google .com-----put in the words,---how to check valve clearance on
Porsche 911.-----our host Pelican has really info on there,regards.

Originally Posted by timmy2 (Post 8886727)

Swap in the old plugs and see if that fixes it. They can be no good right out if the box.
What brand and type of spark plugs did you use?

Originally Posted by avsarinana (Post 8887635)

Put in old plugs same result, still running rough... ?

Originally Posted by turbo owner (Post 8887642)

So, you put all the old parts back on the car and it still runs bad, just leaves the valves in question then.

Originally Posted by avsarinana (Post 8887640)

What kind of resistance readings, should I get when testing spark plug wires. The spark plug wires look original to the car.. car has 117,000 miles

Originally Posted by mreid (Post 8888825)

Based on your description, I don't think your issue is valves. I think you cracked some plug wires internally when you pulled the wires to install new plugs or knocked a vacuum line off it's fitting. Just doesn't sound like a valve adjustment problem.

Originally Posted by jlex (Post 8889081)

Agreed, unless you totally got the cylinders mixed up when doing the valves.... but that's not likely as I think you said you've done valve adjustments before.