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Shelia, 2000 gmc Sonoma v/6 Firing order, firing order for the 4.3L engine is 1-6-5-4-3-2.
Cylinder order drivers side 1-3-5 and passenger side 2-4-6,
Check the attached links,instruction and guides, Good luck
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If the check engine light is on I would have that checked first. The trouble codes in the computer will help point you in the right direction for troubleshooting. You could have a sticking fuel injector, or an ignition problem, or both.
you jave a biggie here.
here is some info CIRCUIT DESCRIPTION The Powertrain Control Module (PCM) monitors the difference between engine speed and transmission output speed. In D3 drive range with the TCC engaged, the engine speed should closely match the transmission output speed. In D4 drive range, with the TCC engaged, the TCC slip speed should be -20 to +60 RPM .
When the PCM detects excessive TCC slip when the TCC should be engaged, then DTC P1870 sets. DTC P1870 is a type B DTC.