Why does my car cut off at a red light and now wont crank up at all sometimes?

ALTHOUGH I MAY NOT BE THE ONE TO HELP YOU HERE

SOMEBODY HERE WILL TRY.I'M SORTA A PRE-COMPUTER KINDA VEHICLE GUY (JEEP CJs)

THE OLE CHECK ENGINE LIGHT IS THERE TO ALERT YOU THAT THE COMPUTER HAS SENSED A PROBLEM THE ENGINE AND SOMETIMES OTHER STUFF

IT IS CAPABLE OF SENSING MAYBE HUNDREDS OF PROBLEMS!

SO LETS SAY MAYBE 2 MONTHS AGO IT SENSED YOUR GAS CAP WAS LOOSE (JUST AN EXAMPLE)

WHO'S TO SAY IT DIDN'T PICK UP ON A MAJOR ENGINE PROBLEM A WEEK AGO. THE LIGHT IS ON, RIGHT?

HERE'S WHAT YOU DOEXACTLY!

MOST POPULAR AUTO PARTS STORES WILL SCAN YOU SYSTEM. USUALLY IT'S A FREE SERVICE!

TAKE PEN AND PAPER

WRITE DOWN EXACTLY WHAT THE CODE NUMBERS ARE. DUMB EXAMPLES ARE P0442, P0167

GET 'EM ALL

THE PARTS STORE GUY MAY GIVE RECOMMENDATIONS OR HIS OPINION AS TO WHAT MAY BE WRONG (HE MAY BE RIGHT) CODES CAN BE INTERPRETED IN DIFFERENT WAYSREASON FOR WANTING THE EXACT NUMBERS. NOT WHAT "HE" THINKS COULD BE WRONG

COME BACK TO THIS POST AND POST THE CODES. SOMEONE WILL HELP YOU. EVEN IF I HAVE TO GO GET 'EM

SHOULD YOU NEED PARTS, MAYBE EXPENSIVE ONES, AND CAN POSSIBLY DO THE REPAIRS YOURSELF (OR FRIENDS) LET ME KNOW 1ST, I MAY CAN SHOW YOU HOW TO SAVE $$$ ON YOUR PURCHASES. I GET ALERTED AS TO ACTION ON THIS POST, SINCE I REPLIED, I WILL BE ABLE TO SEE HOW YOU ARE COMING ALONG

GET CODED. NOW. WHILE IT WILL DRIVE

WAITING ON YOU!

THE MEDIC

. AND

THE EXACT CODE NUMBERS WERE?

THE MEDIC

LOOK AT "CAUSES"...."POSSIBLE SOLUTIONS"

http://www.obd-codes.com/p0420

HERE'S THE OTHER

http://www.obd-codes.com/p0430

I'M JUST "RESEARCHING"......SEE, IT AIN'T JUST A "CUT AND DRY" REPLACE SOMETHING!

THOROUGHLY CHECKING THE STUFF THEY SUGGEST MIGHT KEEP YOU FROM BUYING EXPENSIVE PARTS......IF PARTS ARE "CHEAP", I'M NOT AGAINST THROWING THEM AT THE ISSUE TO MAYBE "LUCK" INTO A FIX

SEE IF YOU CAN PERFORM THE CHECKS THEY SAY---IF YOU DO GOTTA BUY PARTS, LET ME KNOW, I MAY CAN AID IN SAVING YOU SOME $$$

THE MEDIC

IF YOU'D RATHER I FIND SOMEONE ELSE WHO DEALS WITH NEWER STUFF TO CONTINUE WITH YOU, I'LL PUT OUT SOME FEELERS

SEE MY TWO ANSWERS ON "September 03, 2012" 1ST ANSWER STARTS OUT "VERY GOOD".....HERE'S THE POST

http://www.2carpros.com/questions/1977-jeep-cj7-front-wheel-wont-into-4-low

DO LETS US KNOW HOW YOU ARE PROGRESSING

THE MEDIC

PROBABLY NOT GOING TO HAVE A CODE UNLESS THE LIGHT IS ON

GLAD YOU MADE SOME HEADWAY!

EVEN THOUGH COMPUTER CARS ARE NOT MY STRONG POINT.I'VE SEEN MANY TIMES WITH OTHERS' VEHICLES. WHEN THE 1ST CODE IS TAKEN CARE OF SOME, IF NOT ALL OF THE OTHER CODES DISAPPEAR

AS FAR AS THE CAT, A MUFFLER SHOP MIGHT BE THE PLACE TO GET IT CHECKED OUT, THEY MIGHT EVEN DO IT FOR FREE

THE MEDIC

I'M STILLA WORKIN' ON YOU HERE.I ANSWER THE CJ5 AND 7 FORUMS. MOSTLY. MY MISSION. THAT IS. WHEN SOMETHING FINALLY GOES WRONG WITH ONE (USUALLY NOT IT'S FAULT)

WHEN THERE AIN'T NONE TO ASSIST, I VENTURE OUT INTO THE OTHER FORUMS AND DO WHAT I CAN. OR WIN SOMEONE OVER TO OUR SIDE!

I'VE HAD 6 CJs AND 1 WILLYS. NOTHING ELSE, SINCE I STARTED DRIVING ON THE ROAD IN 1981.

. HAD MY LAST 1977 CJ 5 ("MR. JEEP")[NOW 35 YRS YOUNG] AND MY 1946 WILLYS ("WILLY")[NOW 66 YEARS YOUNG]SINCE THE EARLY '90s. BOTH ARE MY PRIMARY MEANS OF TRANSPORTATION, MORE SO, "MR. JEEP", HE IS MUCH FASTER. BOTH KEEP ME TOASTY IN THE WINTER."WILLY" WEARS HIS HARDTOP AND DOORS

SO WHAT I'M TRYING TO SAY HERE IS. WILL YOU 'LIKE' THE OLE LINCOLN WHEN IT'S 30 YEARS OLD?

(BY THE WAY. HOW'S IT DOIN?)

LIKE ME, YOU TOO, COULD LOVE YOUR "REAL"."NEVER LET YOU DOWN"."LONG LIVING". JEEP. EVEN MORE IN 30 YEARS, THAN YOU DID ON "DAY ONE". FEW VEHICLES WILL STILL TURN HEADS, AS A JEEP WILL. EVEN WHEN THEY'RE OLDER THAN YOUR GRANNY!

SPIT IT OUT. READY TO LEAVE THE OTHERS BEHIND?

THE MEDIC