Recently bought a 99 blazer. It was overheating and needed the lower intake gasket changed as it was leaking. It ran prior to the gasket change, but now it only turns over and will not fire. I am getting gas and spark, it also got a tune up. Any suggestions as what to look for would be appreciated. There are no codes either......

 

Most likely the distributor is out of time, with some searching on here and google you should be able to find the proper way to set it up from scratch, these distributors need to be set very close to dead on in order to work, you actually need a scantool to set it perfectly but it will run without. Basically the engine needs to be turned to #1 TDC compression stroke, then the distributor rotor needs to be aligned with a mark on the distributor body when its dropped in, its real easy to be off a tooth and it will run like crap, two or three and it may not run at all.

 

Thanks. It ended up being the timing.