Yes, systematic troubleshooting procedures can minimize frustration, wasted time, and money.
Your suggestion for the next step (loosening the injector union nuts one-by-one and watching/listening for diminished idle or non-affected idle) was a good one, good call!
rado561 when you perform this test try to keep fuel from dripping or spraying on the coolant hoses.
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1985 744 gle d24t
1985 745 gle d24t
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