Rent or borrow a tool from a parts store. Remove a spark plug and screw the tester fitting into the spark plug opening. Crank the engine over 5-10 times tops. Read the gauge. Release the pressure, remove the fitting and hose, replace the plug, and move to the next.
Roaring is possibly an exhaust leak. Surging and shaking is probably a vacuum leak. Vacuum leaks can be found using carb cleaner.
Saturday, March 24th, 2012 AT 4:42 AM