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7.4 Vortec idles great but hard misfire while downshifting
Any help is appreciated! Trying to diagnose what the heck is wrong! Refrence: My Dad owns a ‘98 2500 with the 7.4/454. We just did a tune-up (new cap, rotor, plugs, wires, spark plugs, and fuel pump) after replacing the ignition switch since it went out. Afterwords, the pickup is hard starting...- bighoss
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- Replies: 1
- Forum: Engine Performance + Maintenance
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