car stops at about 5 miles every time when cool on 1995 Oldsmobile Cutlass Supreme

when cool car stops every time at about 3 to 5 miles. seems like loading up. will restart and after about 5 restarts will start running more normal. gas mileage down about 4 to 5 miles per gallon. had new egr added and ran great for about three weeks then started same thing again.

by in Overland Park, KS on September 02, 2012
3 answers 2 comments
ANSWER by on September 02, 2012
start with basic checks. fuel pressure, spark check. one of them will be missing and then we can focus on that system Roy
ANSWER by on September 02, 2012
ANY LIGHTS ON LIKE CHECK ENGINE?
COMMENT by on September 02, 2012
check engine light will normally come on sometime during drive. has uaually indicated egr. not always on when car seems to overload and stop. horrible exaust or engine smell when first restarting which usually takes agout 4 or five times while coasting or stopped. thanks for your assistance.
COMMENT by on September 02, 2012
HAVE SCAN TEST FOR COOLANT TEMP. SENSOR WITH COLD ENG. SHOULD READ THE SAME AS OUTSIDE (AMBIENT) TEMP. HAVE SENSOR TESTED MECH. WILL KNOW HOW TO DO THIS. STILL MAY BE EGR RELATED.
ANSWER by on September 02, 2012
YOU ARE RUNNING VERY RICH HAVE DIAG DONE. THESE ARE KNOWN FOR BAD MASS AIR FLOW SENSORS ALSO