Quote:
Originally Posted by fourwd1
To start with it sounds like you are running rich (too much gas).
Could also be a timing problem.
Also, in a 22R that old the EGR passages could be clogged, from the valve all the way into the intake manifold. I've had mine completely blocked solid with carbon.
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Since my original post I've discovered that at least part of the problem is a damaged Auxiliary Accelerator Pump diaphragm. I disconnected the vacuum hose and plugged it. Aside from it being hard to start the backfire is gone. It's only a temporary fix. I'll have to change the diaphragm to make sure that's the problem.