94 Buick RoadMaster Estate Wagon LT 1 issues

[vilefly]

Measurements to take:
1) cylinder leakage test (not a compression test)
2) vacuum reading at idle (does it fluctuate too?)
3) results of spark output test per plug wire (also test ignition coil separately)
4) exhaust backpressure test per side (in PSI)
5) fuel pressure KOEO and KOER (does it bleed down?)

get lisle #20700
Attachment 14841

get backpressure tester
HTB1A3vyHf1TBuNjy0Fjq6yjyXXaF.jpg
And......remove nothing except the spark plugs and o2 sensors to do the tests. Be efficient.