With a vacuum gauge installed idle vacuum reads 15 inches. open throttle and vacuum drops to about 5 inches and engine backfires out exhaust. Removed exhaust to check for obstruction and same thing happens. Installed exhaust manafold press gauge in o2 sensor a...

FIX posted 8/22/2000

iATN Members:
Login to view full TechHelp request
Auto Repair Pros:
Join iATN to read this TechHelp request
Vehicle Owners:
Find a nearby iATN member to repair your vehicle