I have a 68 Shovelhead that starts fine, runs fine at low rpm, but when it is under load with increased rpm; it misses. I have installed new plugs & replaced the gas line filter, changed fuel.

SOURCE: 1994 safari van V6

ya these motors need tons of fuel pressure so if you have a pressure tester test the fuel pressure prior to the fuel filter and see if it is atleast 25 psi if not replace pump with new or rebuild all the luck to you with current project

SOURCE: Triton V10 Engine Shudders under load

have your fuel system vacuumed out our excursion did it as well the injectors are not at fault it is the fuel lines

SOURCE: spits sputters like its missing when u give it to much gas

Have you tried the fuel filter?

SOURCE: 1996 Chevy Tahoe- replaced pcv valve, air cleaner,

have you checked the tps sensor?

Marvin

• 85242 Answers
• Posted on Jul 19, 2012

SOURCE: run rough low power gas smell

Hello
The engine and transmission in this cars drive train are fully electronically controlled by a computer called the PCM (Power Train Control Module). Whenever a problem like this occurs the computer stores a record of the problem (there are of course some exceptions to this, like the fuel pump, engine coolant temperature sensor and MAF sensor for instance) in the form of a fault code in its memory, to read these fault codes you must have the systems memory scanned with a special tool. Once the fault code(s) are read you then must perform the appropriate diagnostic testing to find and resolve the problem(s) DO NOT REPLACE ANY PARTS UNTIL A TRAINED TECHNICAIN HAS DIAGNOSED THE PROBLEM TO AVOID SPEDING YOUR HARD EARNED MONEY ON PARTS THAT MAY NOT CORRECT THE PROBLEM