Last fall I replaced my engine with another stock 5.0 because the oil pump driveshaft on the original engine twisted up like licorice. The replacement engine got new intake/exhaust and water pump gaskets as well as front/rear main seals. I put it in the car and along with some minor things like a small coolant leak and slight exhaust tick it's running kind of oddly.
The car will run and rev just fine but it will occasionally sputter. When it does sputter the tach goes crazy and bounces around. It usually will do this the most at around 3000rpm. It only does it sometimes though and I'm not sure what is going on. I also hear a bit of clatter, I can hear it best if I rev it to 3000rpm and then take my foot off the gas and let the rpms drop. Any ideas what it could be? I'm hoping its just bad gas since the car sat for ~9 months but I had Stabil in a full tank so I'm not sure...
The car will run and rev just fine but it will occasionally sputter. When it does sputter the tach goes crazy and bounces around. It usually will do this the most at around 3000rpm. It only does it sometimes though and I'm not sure what is going on. I also hear a bit of clatter, I can hear it best if I rev it to 3000rpm and then take my foot off the gas and let the rpms drop. Any ideas what it could be? I'm hoping its just bad gas since the car sat for ~9 months but I had Stabil in a full tank so I'm not sure...