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Found 3 results

  1. I have a 2001 silverado with the 5.3. It has about 153,000 miles and I have been having an issue that I haven't been able to track down. At idle it has a miss at idle, whether it is cold or warm. My knowledge says it is a vacuum leak somewhere that I cant find. There is no miss at any other rpm than idle. Recently as it has been getting colder (sub-30 degrees F) when I first start the pickup it shakes violently at idle, but after it warms up for about 30 seconds it runs as normal. Today when I started it and was warming it up my SES light started blinking, even though it was idling as normal. I shut the truck off because I knew that meant a multiple misfire code. I tried to start the pickup and it would not start. I plugged in my code reader, and I found the code P0300, or multiple misfire. I cleared the code and it started up and ran just as normal, with no issues. I drove it around 30 miles, shutting off an turning it back on numerous times to try and duplicate the issue but the code never came back. I have checked the intake gasket, which seems to be very intact. Where should I look next? Thanks for the help in advance.
  2. Hi group. I own a 98 GMC Sierra SLE K1500 5.7 Vortec. It's got over 220,000 miles, I recently did a major tune up. Plugs, wires, cap, rotor, oil, oil filter, air filter, cabin filter... It's been running like a top, for over 9 months. I started it the other morning after it was of all night, & it idled like crap. I shut the porch lights off & looked under the hood, it looked like the 4th of July. Sparks are running up & down the wires & all over. I know the wires are in the correct order because I only pulled them one at a time to replace them. The same with the plugs, & they are properly gapped. The cap & rotor will only go on one way. The wires are lifetime warranty & I replaced them last night. Yet it still is running like crap. Anyone got any ideas?????...
  3. I have a 1999 sierra with a 6.0. It has a really bad miss and the lights dim and the volt gauge drops from 14.1 down to about 9 when the rpm's get over 2500. but if i turn the tow haul on it will go up to 4000 rpm's before it does it. i have changed the battery, alternator, plugs and wires. I still getting upset and i just want it fixxed. Any ideas?
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