Misfire

[Ragtop9268]

2000 Tahoe 5.3 cylinders 2,4 and 8 stopped firing overnight. Unplugged everything and plugged it back in, checked spark plugs now 2 and 8 are working but still no 4. Swapped coils and 4 works occasionally. Fuel pump, pressure and filter all good, no vacuum leaks. Just intermittent spark on 4 and I think 2 and 8 still drop out occasionally.

 

[iamdub]

2000 Tahoe 5.3 cylinders 2,4 and 8 stopped firing overnight. Unplugged everything and plugged it back in, checked spark plugs now 2 and 8 are working but still no 4. Swapped coils and 4 works occasionally. Fuel pump, pressure and filter all good, no vacuum leaks. Just intermittent spark on 4 and I think 2 and 8 still drop out occasionally.

Check the ground wire starting at the stud on the front end of the passenger side cylinder head, where the main battery ground goes.

 

[wjburken]

2000 Tahoe 5.3 cylinders 2,4 and 8 stopped firing overnight. Unplugged everything and plugged it back in, checked spark plugs now 2 and 8 are working but still no 4. Swapped coils and 4 works occasionally. Fuel pump, pressure and filter all good, no vacuum leaks. Just intermittent spark on 4 and I think 2 and 8 still drop out occasionally.

I’m addition to what @iamdub mentioned, check the condition of your PS coil harness.