i have a 93 s-10 4x4 (143,000mi) with a 4.3 (z VIN)with an automatic tranny.it has a slight knock during acceleration and feels like it's missing.if i keep it in park and keep the RPM's up there is no noise only in forward gears.i found a plug that had broke and replaced it but no fix,since then i changed the 02 sensor, knock sensor and fuel filter.i had a guy check for spark at the distributor cap and i think it was #3 & 5 did not have spark at the cap.he then did a compression check on the number 3 cylinder and said it was only at 50 pounds.will no spark affect the compression of a cylinder since the coil is unhooked for a compresion test.at my whitts end trying to figure out why my truck isnt running right.any help would be greatfull.
May 18, 2007 at 7:43 PM
