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Hello my name is XXXXX XXXXX I will assist you today. It sounds like your cat converter may be clogged. A back pressure test will confirm the cat being open or clogged. The fuel pressure should also be checked as well. How old is the timing belt????
Sorry Roy, But i did not want to mention this because it do not meet EPD standards and exposed myself. I removed the Pre-Cat catalyst that's attached to the Exhaust manafild and Post catalyst converter and remove the honey cones from both. This was the first thing I tried to correct the problem. My Plan was it if worked I will install new ones to get my inspection tag.
Also, I have change the fuel pump and checked the [pressure. It's in spec range.
OK. Then the other thing is either the timing belt retarding the timing or the compression is low. Roy
Doubtfull the muffler is clogged. You cannot adjust timing. The timing belt may be worn and effecting the timing. Roy