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When you say the timing belt is good, do you mean you didn't replace it or the timing marks are lined up?
were the heads machined?
When the marks are lined up, where is the woodruff key pointing? Like 3 o'clock or 6 and so forth.
Is it possible for you to send a pic of your marks? With the compression it sounds like it should be good. That makes it seem like a coil issue or perhaps the plug wires are possibly crossed?
I wouldn't expect the coil to fail just sitting there to be honest, but it sounds like you are spot on with the timing marks to me. Compression is good.
The only other thing I think could or would cause this is if you missed a ground wire someplace. I see no other reason for the problem of misfiring on all 4, especially if you didn't do any adjustments and just swapped out the gaskets.
unless there is some issue with the new plug wires causing problems with the plugs..
I'm sorry, I may not be able to help from here and if you would like I can open this back up for the other experts.
Hi,I'll see if I can help,please check the bulk head harness connector located on passenger side for poor connections we find sometimes this harness gets pulled/stretched etc..while doing head gaskets .Sometimes while the car is running you can manipulate this harness and create or diminish the rough idle and misfires.Check it out and let me know ,thanks
Remove and check egr valve ,the valve could be hanging up causing this problem ,once you the valve removed you can see if the valve is sticking by moving it with a screwdriver.
Ok let me know,I'll be back tomorrow evening.
That great news,glad it's fixed!