spark plug gap

[HuskieMobileMan]

After starting my new engine, I am having trouble with a rough idle and 2 of the cylinders don't appear to be firing correctly. I take the plugs off the cap and the idle on the engine does not change. All others drastically affect the idle.

 

Anyways, I was wondering about the recommended gap on my plugs. The stock plugs on the engine had a gap of .035, but the NGK platinum plugs that I put in list a gap of .045. Should there be a difference in gap between plug types? I am going to try to regap the two at .035 and see what happens.

 

BTW, all other plug types also list a gap of .035 except for NGK.

[HuskieMobileMan]

Well, I replace the distributor cap, rotor and the ignition coil and still no success on either cylinders. I tried swapping the spark plugs and wires with two adjacent cylinders and I still have the same problem on the same cylinder. So it is not the plug or the wire at fault. I also tried the .035 gap on the plug with no success. I also tried a compression test on one of the cylinders and got 150 PSI which is also good.

 

The bad cylinders are the 3 and 4 cylinders that are right across from each other. I believe that the 1 and 3 cylinders and the 2 and 4 use the same port from the intake manifold for the air fuel mixture, and can't believe that I f'ed up the intake manifold gasket so I don't think it is that.

 

I guess I can take off the valve covers and check the operation of the rocker arms and the push rods. Any other suggestions?