1998 Chevrolet Express 2500 Questions

All 1998 Chevrolet Express 2500 Questions

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i cant seem to get spark ...it says there is an crankshaft sensor code . but its new??? \
It seems to make the motor click and then lose power.
Seemed to fixed problem but then started doing the same thing. Any ideas what to try next.
can't get replacement rear a/c lines. the original lines rotted through over the rear axle. the replacement lines are in 3 sections, but can't get all 3 sections.
Where is the low side AC service port on a 1998 Chevy Express? Do I add the R134 with the engine on or off?