Question about 1994 Chevrolet Suburban

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When my truck is at idle or going down the road it has a miss in it and I put new plugs wires and cap on it and it is still doing the same thing

Posted by Anonymous on

  • jack of all trades ,
    jack of all trades , Jun 05, 2014

    if I were you I would do a compression ck , there may be a bad valve in it , I had the same problem with my truck 1977 chevy pickup with the 350 engine , I changed everything and done a compression ck , usually if it is a exhaust valve bad you will hear it pop pow , every once in a while like a backfire , but if it is a intake valve you will not get anything but the miss you are speaking of , keep us posted , make sure you do not have one of the plug wires mixed , 18436572 and number one is on the driverside first plug in the front , hope this helps


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Posted on Jan 02, 2017

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SOURCE: 1996 Chev. 1500 pickup truck, 305 C.I. PO300 code

Than you problem solved by yourself already,

Dear you had done good job for your dream,

just some modification nedds like,



Posted on May 20, 2008

  • 160 Answers

SOURCE: truck stumbles just off idle

may need to have a fuel injection service,but when i worked at chevrolet i believe those year trucks were having a problem with the throttle body sticking

Posted on Nov 14, 2008

  • 120 Answers

SOURCE: 1998 Chevy 1500 Z71 5 speed random misfires

does it have a coil if so check it

Posted on Feb 18, 2009

  • 666 Answers

SOURCE: 1991 Chevy Caprice, V8 5.0L, throttle body

tune up is likely what you need from description

Posted on Jun 15, 2010

Testimonial: "thanks for replying, thats what I thought too, but I have another question, I just added more comments to the prior comments, please read. thanks again. "

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SOURCE: I have a 2005 chevy avalanche 1500 5.3L 327, i

The carbon on the spark plugs and black smoke coming out the tailpipe means you are running rich. (Too much fuel) this can becaused by anything from a bad Mass Airflow Sensor to a stuck injector to a leaking Fuel Pressure Regulator to a bad Upstream Oxygen sensor.

First, you need to check fault codes to see what the computer says the problem is. I would not be pouring injector cleaner in your vehicle unless you are absolutely certain the the cleaner you are using is going to be compatible with your fuel system. I've seen a lot of fuel system damage as a result of that.

In 2005 Chevrolet Avalanch had two different 5.3L engines one was flex fuel and the other was not.
The 8th digit in your VIN will tell you which engine you have. if it is a "T" it is standard gasoline and if it is "Z" it is a flex fuel engine.

There are several Technical Service Bulletins (TSB's) issued by GM for the fuel systems on BOTH of these engines. Depending on your engine type and the codes retrieved from the Engine Control Module, these TSB's may or may not apply to your problem.

Posted on Dec 02, 2010

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