Question about 1989 Chevrolet K1500

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1989 chevy silverado spark plug gap?5.7 k1500

Was idleing badly.when in park or neutral it idled fine.put in reverse and shuts off.put in drive n boggs down at stop light.changed plugs,idle plug,wires were new already and seem fine.however when i chenged plugs i bougt platinum and autozone told me they didnt need gaping.gap was 60.old plugs were gapped at 45.went backk to autozone and another guy gave me a dif set of plugs and said gap should b 35.now idles bad in all gears

Posted by gary on

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  • gary Mar 22, 2013

    also replaced vaccum lines from throttle body on both sides and new pcv valves

  • gary Mar 23, 2013

    nobody has told me what the gap should b on a 5.7

  • Louise Hockenson
    Louise Hockenson Oct 14, 2021

    I'd look up your spark plugs , must be a chart that tells that.

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1 Answer

Thomas Perkins

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  • Chevrolet Master
  • 14,968 Answers

Always use stock type plugs,that what there called for,some vehicles like yours don't run good on other types.They come set at factory,I always check gap and they are always right.As they say,it ain't broke don't fix it.

Posted on Mar 22, 2013

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5 Related Answers

ROBERT

  • 67 Answers

SOURCE: 1995 Chevy K1500 4.3L V6. Engine has inconsistant idle

Have you changed the fuel pump yet?I had the same exact problem.I replaced my fuel pump with an AUTOZONE PIECE OF JUNK fuel pump.That pump lasted almost 2 days.The second day i had it the truck didnt want to start but it did and it ran like ****,and when i put it in gear it ran as long as I didnt touch that gas pedal.You could go get a fuel pressure test or just replace it,your call.You might want to check your filter too but im sure its the pump.Good luck

Posted on Apr 27, 2009

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Anonymous

  • 195 Answers

SOURCE: 99 chevy silverado Unstable idle when it worms up

Hello;
It sounds as if you have a small vacuum leak some where in the intake system. Also since you cleaned the throttle body also clean the MAS. It is located between the air filter housing and the throttle body. Hope this helps, rate me highly.
Thanks;
Rich
RPM Northwest

Posted on Feb 07, 2009

breiden1

  • 4 Answers

SOURCE: 1990 chevy lumina, idling problem... to rich.... stalling......

check egr valve for vacuum leak. pull hose from manifold. put hose in your mouth like a straw and **** on it. if the valve moves, then it's good. if it doesn't, you need a new egr valve. WARNING, they are fricking expensive! auto zone price $204. NO JOKE

Posted on May 14, 2010

kyleyeo23

kyle

  • 31 Answers

SOURCE: i have a 98 chevy malibu. it had loss of power and

sounds to me like your cat is pluged.

Posted on Sep 12, 2010

Anonymous

  • 4 Answers

SOURCE: 1992 Chevy Silverado idles rough why?

Check your MAP and TP sensors. Your throttle body may be having trouble determining position and is compensating by adjusting RPMs.

Posted on Nov 30, 2010

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