Just put in a set of Bosch platnum spark plugs. I am now getting the code p0300 which is multiple cylinder misfires. Anyone else have problems with these plugs?

 

You probably didnt gap them right, didn't tighten them enough, didn't connect the wires correctly, or you could have router the wires in a fashion that could cause one of them to burn.

 

....or you cracked an insulator, or didn't tighten one of them all the way, or.....

Which Bosch plat's are they.... single ground, double ground, quad ground elctrodes?

 

They are the single ground plugs. I did them while I was changing the k-member. It is REAL easy with the k-member off. Plugs were torqued and installed with anti seaze and silicon lube on wires. The plugs were all gapped to .050.

 

I just got this trouble code and all my trouble codes came within 45 minutes of driving. My plugs are fine, and gapped right, I believe it's a spark plug wire that needs to be fixed.

 

When my motor was stock my car ran like crap with the Bosch plugs, immediately after I changed to them. Replaced them the next day with new stock AC Delco plugs; problem solved. All the boots were on properly too.

 

I have NGK TR55 plugs, will be testing for arcing and burnt wires later.

 

i hear tha platnums are crap for our cars, many ppl have problems with them ,
u could have crossed wires, gapped em wrong, id put my money on the plugs being teh problem