jblazer00

My 2000 Blazer Keeps Getting Random Misfires And I Think The Tensioner Is Bad But Would That Cause That? Ive Replaced Plugs,wires,fuel Pump Etc And I Think It Could Be Injectors But I Dont Want To Spend The Money If It Could Be Somthing Cheap

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2000 BLAZER 2 DR 4X4
COLD AIR INTAKE
RAVIN Z55 MUFFLER

83cutlass

No, a tensioner can't cause misfires

old_master

DTC P0300 is usually caused by a fault in the secondary ignition system, (spark plugs, spark plug wires, distributor cap, distributor rotor & ignition coil). If secondary ignition is the cause of the problem, and AC Delco tune up parts are used, the P0300 usually goes away.

P0300 can also be caused by a fault in the fuel delivery system. Depending on what the problem is with the fuel system, it may or may not set any other DTC's. Checking fuel pressure and leakdown rate will determine very quickly if the fuel system is operating properly.

Your cold air intake may also be causing the DTC to be set. Some of them use oil on the air filter which is "nuttin' but trouble" for the Mass Air Flow sensor.