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denisecapps send me a PM, there is some bum info on here.
If you sucked in some seaweed and your strainer is not working good,
the intermediate shaft could have skipped a tooth making running difficult ( the shaft turns the raw water pump as well as the dist.).
When that happens, the crank and valves are still in synch, but the points/ sparkle rotor lose synch.
I can send you pic's of how I set up the timing on my engine, a B230 which is basis for both the AQ125 and 131.
Here is a pic looking at timing gear from the rear/top of engine the red/yellow thing at top is the heat exchanger lip which covers the gear making it hard to see.
Crank is at TDC (actual) the timing mark on the harmonic dampener is not always accurate.