thank you sir this information was very helpful.

 

But I recently changed both of those gaskets. My friend wants to redo them just to make sure it seated correctly.

 

I thought there was a such this as an exhaust manifold gasket?

 

I don't think my cat is clogged but it needs replacing due to the ratteling sound I hear in there.

 

If you can get a hold of an infrared thermometer you can test the temps before and after the cat, should be a little bit hotter coming out than going in.

I think harbor freight has one for $29 right now, pretty good deal.

Mine was something like 300 degrees hotter going into the cat, thats very bad.

 

SnapOn Vantage meter with high voltage module
in the hands of the right trainned mechanic
can identify the source of the miss-fire problem

 

Roger that will try to get one....I thinnk my friend's shop might have one. I really appreciate all the imput.

 

ok i bought a set of exhaust manifold gaskets and will install them this weekend will give an update. if this does not wrk then new heads will be on the way.

 

If #5 is repeatedly misfiring, you may just need to inspect that head and rebuild it if the valve seat is not cracked. Misfires can be caused by a stuck valve, which may be your case. Getting the head rebuilt is a far cry cheaper and easier than shelling out big bucks for new heads you may not need (yet).

 

That's what my friend said. Like I stated earlier in the post I was running Iridium skp plugs which I found out were too " hot " for my ignition system. I bought a can of Sea Foam yesterday and one of the proceedures was to SLOWLY pour 1/3 of the 160z can into the TB while the engine was warm and running . Then shut down the engine wait 5 minutes then restart. This procedure is to clean the valves. What do you think?