My pickup has been running perfectly for a week after installation of a new heater core and heater control. When started today (cold, 20F morning) it started immediately, ran the fast idle warmup then cut back to normal idle speed. When I attempted to drive it the engine accelerated to about 2000 rpm but did not have sufficient power to drive the vehicle. More accelerator pressure caused it to barely run, very rough and rich and missing, then stop. Re-starting while warm, it would run smoothly at the 2000 rpm speed but any more accelerator would cause it to choke down and stop as described above. Plugs, wires, distributor parts, air filter and gas filter are new. Gas pressure measured at 35 psi. This is a low mileage (77,000) ranch vehicle but has recently had a few trips on the highway at legal speed. Have disconnected and replugged everything within reach. Suggestions?
PS Since this is a timing chain vehicle the engine warning light has been on since 60,000 miles. Haven't wanted to pay the $150 that the local Mazda dealer charges to turn it off.
Wednesday, January 26th, 2011 AT 9:09 PM