JBClassix Industries
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08/15/2025
P0304 cyl 4 misfire 1999 GM L31 5.7L. When you see someone already installed a new ignition system and there are new seals on the upper intake, you already know the problem is internal. Compression test verifies and leakdown test identifies exhaust valve problem. Easy-peasy!
07/20/2018
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Greeley, CO
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Opening Hours
| Monday | 8am - 5pm |
| Tuesday | 8am - 5pm |
| Wednesday | 8am - 5pm |
| Thursday | 8am - 5pm |
| Friday | 8am - 5pm |
| Saturday | 8am - 5pm |
| Sunday | 8am - 5pm |
