Each of the two injectors on your TBI feed one bank of the engine. I have had a problem in the past with a marginal electrical connection to one of the injectors which gave those same symptoms.
You need to find the cause since if one of the injectors is firing only sometimes, you end up running really lean on that side of the engine which can quickly lead to burned valves (the voice of experience).
-------------------- Jim Paget
88 YJ with a few changes
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